I use the NAP Quiktune 2000 drop away. I love it. The 5 minute installation is BS, but it only took me an hour to install it and adjust it to centershot. I had to read the instructions three times to completely understand it (the photos can be somewhat confusing). When I paper tuned it, I was shooting bullet holes at 6 feet on the third arrow (two minor adjustments). Backed up to 12, 18, and 24 feet and the tune held true. I'm shooting better groups consistently (1 1/2" 5 arrow groups at 20yards; good for me). I don't regret going with the Quicktune. I hope this helps!