I have one, and am not impressed for the cost. It is a easier install (slightly). It is more secure, and repeatable if removed. I like mine, but wouldn't buy another at the much higher price point that it is.
It eliminates the need to level the rest. The launcher is aluminum, not plastic like all the other QAD's.
I bought the standard one. I like the rail mount but IMO it wasn't worth an extra $100.
Strength and security, although I can't say I've had issues with the berger button mount style. I don't like QAD rests, so it bummed me out that Hoyt went with that as their flagship.