there are a few good ones
I have a NAP Quicktune 2000 on my hunting bow and a Copper John AlleyCat on my target bow; they both work well. The alleycat is good for target, but I wouldn't use it for hunting. There are better ones out there for hunting than either.
Most folks that have tried them like the Trophy Taker rests, probably the top rated. I've met several that like Muzzy's Zero Effect, and I have shot one and it is smooth. I'll probably trade my NAP for the new Cobra drop-away. It is obviously a Trophy Taker replica with a bit of a twist on the arrow holder; it's located on the arm of the rest itself; a very simple design, about $50, and I like cheap and simple.