The most valuable feature of ServiceNow is the user interface because you can customize or configure it directly from the user interface by using the mouse. It is easy to use even for non-IT people.
You can also directly plug your ServiceNow instance within your Microsoft Active Directory and then retrieve all your users and groups. So, you can use the users and groups to put automation inside the application. When you have new hires, you can automate the group security and group attribution.
It is very good in terms of performance. Its performance is almost 100%. Once, it took less than two minutes to back up and run an instance. It has very good reliability.