I have never used a drop away, so I can't comment from personal experience. But this past hunting season I did use Golden Key's Royal Hunter rest. It is similar to the Rover, but uses either TM type launchers or the horse shoe launcher. This is the quietest spring launcher hunting rest I have ever used. It makes NO sound as the launcher returns to the up position and is some kind of silky smooth.

Here is a pic of it.

http://www.goldenkeyarchery.com/NewWeb/new.htm