I know I'm a little late replying to the post. This is what I have found about the drop away rests. I used to work at the old South River Archery. Two factors are involved with a drop away rest. Bowhand torque and fletching clearance. First I'll talk about fletching clearance, for this is why I went to one. If you have proper clearance a drop away won't provide any significant advantage(remember this is only 1 of 2 parts of the puzzle). With the advent of carbon arrows the diameter of the arrow decreased therefore reducing the spacing between the fletchings making clearance more difficult. with the dropaway, the rest is out of the way when the arrow fletchings reach the rest so absolute clearance is assured. That was the problem I encountered when I went to carbon arrows. My groups were not very tight. I started shooting nocks off after switching. The second advantage is bow hand torque. On regular rests the arrow shaft rides the rest the entire length and your form and hand torque may affect arrow flight. With the drop away rest once the arrow leaves the string nothing affects the arrow, it's in flight. Kind of like lock-time for a gun. There is a third niceity. Only the rest position, nock position and horizontal position are needed for a new set up. Rest spring tension is eliminated. Paper tuning is alot easier.
I used the NAP 2000 Drop-away on mine and have installed several for friends. All with positive results. Of course brands are a personal choice. Look for easy set up and simple design to help with future adjustments and repairs. Most don't need a bowpress to be installed but some might.
Sorry for a long reply....hoped it helped.