The most valuable feature are the caching capabilities using the storage class memory.
Microsoft Storage Spaces Direct offers improved reliability with no single point of failure and excellent caching through storage class memory, providing significant storage expansion akin to hyper-converged systems. It delivers performance three times faster than VMware. Despite key advantages, the system lacks scalability with only two nodes, faces challenges in hardware compatibility certification, and has low-rated customer and technical support. Documentation and sizing tools need improvement.