I rate stability a nine out of ten.

It has been very stable.

It exhibits robust performance, and we encountered no stability issues throughout the testing process. The performance metrics reported were not only accurate but also very closely aligned with the maximum performance achievable from the hardware itself.

It's very stable, works on Windows OS, and does not have its own hardware so stability partially depends on the hardware you are running it on and if your windows os is patched regularly but if you have sorted those two things their software is really stable. 

StarWind Storage Appliance is stable.

Its stability is very good.