My rest is the 'Ultimate Fall Away' from Vital Bow Gear and it is great. You can hold the bow in any position before the shot and the arrow WILL NOT FALL OFF THE REST. It is a fall-away rest with a mechanical 'arm' that holds the arrow in place until the bow is drawn. It is very quiet and works great.

You can check it out at http://www.vitalbowgear.com/arrowrests.cfm