A10 Networks Thunder SSL Insight (SSLi) vs Symantec SSL Visibility Appliance comparison

A10 Networks and Broadcom are both solutions in the SSL/TLS Decryption category. A10 Networks is ranked #2, while Broadcom is ranked #1. A10 Networks holds a 28.9% mindshare in STD, compared to Broadcom’s 22.3% mindshare. Additionally, 75% of A10 Networks users are willing to recommend the solution, compared to 100% of Broadcom users who would recommend it.

A10 Networks Thunder SSL In...

Read 3 A10 Networks Thunder SSL Insight (SSLi) reviews

490 Views
260 Comparison Views

75% willing to recommend

Symantec SSL Visibility App...

Read 3 Symantec SSL Visibility Appliance reviews

384 Views
384 Comparison Views

100% willing to recommend

A10 Networks Thunder SSL In...

Symantec SSL Visibility App...

Comparison Buyer's Guide

Download the report

Executive Summary

We performed a comparison between A10 Networks Thunder SSL Insight (SSLi) and Symantec SSL Visibility Appliance based on real PeerSpot user reviews.

Find out in this report how the two SSL/TLS Decryption solutions compare in terms of features, pricing, service and support, easy of deployment, and ROI.

To learn more, read our detailed A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance Report (Updated: March 2026).

Buyer's Guide

A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance

March 2026

Download the complete report

Helped 884,976 peers since 2012

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

A10 Networks Thunder SSL In...

Ranking in SSL/TLS Decryption

2nd

Average Rating

9.0

Number of Reviews

Ranking in other categories

No ranking in other categories

Symantec SSL Visibility App...

Ranking in SSL/TLS Decryption

1st

Average Rating

7.6

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of March 2026, in the SSL/TLS Decryption category, the mindshare of A10 Networks Thunder SSL Insight (SSLi) is 28.9%, up from 24.7% compared to the previous year. The mindshare of Symantec SSL Visibility Appliance is 22.3%, down from 32.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.

SSL/TLS Decryption Mindshare Distribution
Product	Mindshare (%)
Symantec SSL Visibility Appliance	22.3%
A10 Networks Thunder SSL Insight (SSLi)	28.9%
Other	48.8%

SSL/TLS Decryption

Featured Reviews

Kenneth Murray

Data Center Network Engineer at BRIDGETON PUBLIC SCHOOLS

Enables our content filter to do its job without any noticeable delay

Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding. We have 6,900 students and about 1,100 staff members. Most of our teachers and staff are connecting through our system. You add to that all the cell phones, the iPads, and all the computers, and then each individual website's connection, that's a lot of traffic in a period of one second. The delay with the SSL decryption turned on is almost unnoticeable. That is great because most SSL decryption solutions — a couple of competitors we did try — their devices crashed as soon as we turned decryption on.

Read full review

cto543714

CTO at a tech services company with 11-50 employees

Feature-rich, works as advertised, and sends decrypted traffic at close-to-line speed to products that can't decrypt

The ability to do SSL chaining is most valuable. It provides the ability to send decrypted traffic at close-to-line speed to products that can't decrypt. So, it can take the decrypted traffic and send it to your IPS or your other tools to be able to see what's inside of that traffic for DLP or malicious content detection. That's the whole beauty of it. It was probably the elephant in the room for the longest in terms of SSL decryption. It can get the high band, especially for places that had a lot of decryption to do, such as big finance companies, big telcos, etc. It is a really good product. It has different features and things built into it. Feature-wise, they're the elephant in the room.

Read full review

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"We have several proxies in our environment, so we localized internet traffic between these proxies. Instead of getting a really huge proxy box, according to our size, we can use three boxes and share the traffic with A10's load-balancer feature."

"This is one of those devices that, once you turn it on and it's functioning properly, you'll forget that you have it."

"With the Thunder SSLi, we're better protected. We can stop use of VPN and proxies. We are better protected against dirty traffic coming back to our schools. Having a secure decrypt zone with the equipment lowers the chances that our security infrastructure could possibly miss an attack."

"With the Thunder SSLi, we're better protected; we can stop use of VPN and proxies, are better protected against dirty traffic coming back to our schools, and having a secure decrypt zone with the equipment lowers the chances that our security infrastructure could possibly miss an attack."

"Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding... The delay with the SSL decryption turned on is almost unnoticeable."

"By not renewing six proxy boxes, rather just three of them, it saved over $100,000."

"The most valuable feature is the Fail-to-Network (FTN) option, which means that if for any reason the appliance goes down then there is no interruption in traffic."

"Since implementing this solution, we have enhanced our detection rates and our proxy."

"One of the most valuable aspects of this solution is that it's easy to deploy without a lot of complications."

"This is the easiest solution and I did a little bit of research before and I could not find another solution that does this."

"The ability to do SSL chaining is most valuable. It provides the ability to send decrypted traffic at close-to-line speed to products that can't decrypt. So, it can take the decrypted traffic and send it to your IPS or your other tools to be able to see what's inside of that traffic for DLP or malicious content detection. That's the whole beauty of it. It was probably the elephant in the room for the longest in terms of SSL decryption. It can get the high band, especially for places that had a lot of decryption to do, such as big finance companies, big telcos, etc."

"The most valuable feature is the Fail-to-Network (FTN) option, which means that if for any reason the appliance goes down then there is no interruption in traffic."

Cons

"SSLi is a very powerful device. It has many features and to get them configured is kind of tough."

"There is one thing I would like to see changed. In their features for setting things up, there is a templating system that would normally assist clients."

"I would like them to have a better UI (better universal design)."

"It would be great if it supported SSL operations according to Active Directory users. For example, if we want to bypass one of the servers or a client's internet access for SSL interception, we have to do it according to the IP address. It would be better if we could do it according to the Active Directory username. A10 says they kind of support that but we haven't tested it."

"I would like them to have a better UI (better universal design)."

"There is one thing I would like to see changed. In their features for setting things up, there is a templating system that would normally assist clients. However, we had a better time setting up the device either through the command line or through the interface and not using the templates that were pre-installed. So there is room for improvement to the templates for initial installation."

"From the operations perspective, they have to come up with easier ways so that the operational guys can easily manage it."

"Technical support needs to be improved."

"These days, I have not been happy with technical support."

"We haven't been satisfied with their support for around two months now."

"They're working on being able to handle more traffic. They're working on bigger boxes full of throughput because now networks are going to 40 gigs and 100 gigs. So, trying to keep up with the bandwidth demands is where things are being pushed."

Pricing and Cost Advice

"We always pay for support. Any organization of our size who doesn't is asking for problems."

"When you purchase the equipment, you purchase the licensing and warranty. It's all fairly standard. We haven't been caught with anything surprising."

"Our licensing costs, yearly, are just under $15,000. Your initial cost of acquisition is obviously going to be more than $15,000..."

"Licensing fees are billed annually and we purchased a three-year license."

See which vendors are best for you

Use our free recommendation engine to learn which SSL/TLS Decryption solutions are best for your needs.

See recommendations

884,976 professionals have used our research since 2012.

Comparisons

F5 BIG-IP Local Traffic Manager (LTM) vs A10 Networks Thunder SSL Insight (SSLi)

Compared 32% of the time

GigaSMART vs A10 Networks Thunder SSL Insight (SSLi)

Compared 26% of the time

Comodo Essential SSL Wildcard Certificate vs A10 Networks Thunder SSL Insight (SSLi)

Compared 16% of the time

Fortinet FortiADC vs A10 Networks Thunder SSL Insight (SSLi)

Compared 9% of the time

More A10 Networks Thunder SSL Insight (SSLi) Competitors

GigaSMART vs Symantec SSL Visibility Appliance

Compared 39% of the time

Fidelis Elevate vs Symantec SSL Visibility Appliance

Compared 22% of the time

More Symantec SSL Visibility Appliance Competitors

Product Reports

Buyer's Guide

A10 Networks Thunder SSL Insight (SSLi)

March 2026

A10 Networks Thunder SSL Insight (SSLi) report

Download A10 Networks Thunder SSL Insight (SSLi) product report

Buyer's Guide

SSL/TLS Decryption

March 2026

Symantec SSL Visibility Appliance report

Download Symantec SSL Visibility Appliance product report

Also Known As

Thunder SSLi

No data available

Overview

SSL encrypted traffic is growing, rendering most security devices ineffective.
Gain visibility into encrypted traffic with SSL Insight and stop potential threats.

A10 Networks

The Symantec SSL Visibility Appliance is a high-performance transparent proxy for Secure Socket Layer (SSL) network communications. You install the SSL Visibility Appliance in the network and attach one or more security devices to it. The SSL Visibility Appliance is able to decrypt the SSL traffic, enabling the attached security appliances to see the plaintext (that is, the original unencrypted data) in SSL encrypted connections. It eliminates the blind spot created by encrypted traffic, enables your organization to combat the threats hidden within SSL, while preserving user privacy and regulatory compliance. Powerful policies allow you to bypass specific types of traffic (such as financial or healthcare data) to maintain employee data privacy.

Broadcom

Sample Customers

Klein Independent School District

Information Not Available

Buyer's Guide

A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance

March 2026

Free Report: A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance

Find out what your peers are saying about A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance and other solutions. Updated: March 2026.

DOWNLOAD NOW

884,976 professionals have used our research since 2012.

See our A10 Networks Thunder SSL Insight (SSLi) vs. Symantec SSL Visibility Appliance report.

See our list of best SSL/TLS Decryption vendors.

We monitor all SSL/TLS Decryption reviews to prevent fraudulent reviews and keep review quality high. We do not post reviews by company employees or direct competitors. We validate each review for authenticity via cross-reference with LinkedIn, and personal follow-up with the reviewer when necessary.