I've heard good things about the qad but since I'm new to this whole game, I'm just looking up stuff not to mention wouldn't know the first thing about installing it haha. Right now I'm using a WB...
According to other forums they are having a lot of issues with that rest but plan on fixing them, I personally am a fan of the design but have stuck with my QAD and happy with it.
Definately the hdx, i love that when the rest is up that the shaft is essentially locked in a cage, helps keep those excited shakes from jumping a shaft out of the craddle.