Have used both QAD HDX and Ripcord Code Red
I believe the HDX took a tiny bit more tinkering to get it spot on, but after that, it is flawless.
They are now making the HDX for specific bows, but those are spendy. Love that the HDX stays up in place on slow let down.
Ripcord is a great rest for the price.
Bought a Revolution for my son in law for Christmas 2012, not a bad rest for the price, but I'm glad I bought it for my son in law instead of me.

Seems to work ok, but kinda big and clunky. Guess I like stuff that is compact and efficient.
Have yet to try a limb driven rest, gonna do that some day.