I know alot of guys that have used the QAD rests but I havent had any success with them. Have bought 2 and just couldnt get them to work properly. Was always getting some sort of fletch contact. Make sure you get the lockdown version if you go that way. I have been using the G5 Expert II and have great success with these. It get out of the way and is very user friendly (idiot proof really and I definitely need that). I have one on my 3D bow as well as my hunting bow. I have never tried the Ripcord so really cant offer an opinion on that one.
Good luck. I am definitely a big believer in a drop away rest.
Rick