RoundTower Technologies sells a lot of Nasuni, which is how I came to know about their UniFS solution. Nasuni has come a long way from their early days, and the size of their customer-base is proportional to their growth as a company.
What I like about their product strategy, is they have led with public cloud, rather than adding it on as an afterthought. This cloud-first architecture gives them the unique ability to provide enterprise file services that scale globally across many geographic sites. If you need to provide multi-site enterprise file services and you are currently caught in the mesh of legacy NAS to get that done, then consider Nasuni as an alternative.
SFD16 Nasuni Session Resources: