I have been very impressed with the Vapor Trail Limb Driver.

The rest works in reverse to all of the other drop aways. The cord attaches to your top limb, and instead of pulling the rest up when at full draw, it loosens as the limbs flex, allowing a spring to move the rest up. When the string is released, the cord tightens and pulls the rest out of the way.

I have been shooting mine for about a year, and I can say for sure it has been the easiest to tune, most trouble free rest I have ever used.

www.vaportrailarchery.com