The most valuable feature are the caching capabilities using the storage class memory.
Microsoft Storage Spaces Direct offers outstanding performance, reliability, and affordability, with excellent price performance and valuable caching capabilities using storage class memory. However, scalability is limited with two nodes, requiring a full cluster. Challenges include the absence of a GUI, reliance on PowerShell commands, complicated hardware certification, and inadequate documentation. Storage expansion and elimination of a single point of failure are key features, though more optimization is needed in mirroring.