I've never used it. I think the max servers I've had is 10 hosts. but some of those were free version and some the paid version so it's never really been feasible for me.
I've never used NAV, just the plain old Dynamics/GP. - Which is quite a beast of a system. I've only dealt with it in environments with lots of customization and the interrogator would provide yearly support contracts.
It's been that way with the UnFi Software for a while now. Even 3.x is still in beta those that's what most of use used in production as it works better.
They actually call it something like fast track or something to try and convince people it is not beta.
They are almost identical in how we are standing! LOL
No real surprise. You're basically SAM Mark II aren't you? The younger, newer model. I expect you to eventually overtake him on Spiceworks points and blog posts.