Have been a Unidesk user for about 2 years now and have been very happy with the product for managing our VDI deployment. Chismith summaried most of the key points. Also, maybe it is something with SAN admins, I don't think our's is big on coffee either...
However, I'm in the exact oposite situation as mittim12, have ~600 VDI desktops deployed with Unidesk right now, and all of those are non-persistent, floating assignment.