dave37, the issue with cam timing with standard drop aways (ones the pull the prongs up via the down cable) is real. However, it will not affect the bow so much that it's unshootable or won't perform. It affects letoff, that, you can clearly see with a scale and draw board.

The Limb Driver is the go to rest because its extremely simple to setup and does not impose on the draw cycle of the cams. Same with the Whammy and the new Tripwire.