I bought a drop zone a couple of weeks ago and already sent it back to trophy ridge. It tuned great but after 100 or so shots my groups started opening up and I noticed my fletchings tearing from contact. Played with it and things only got worse, finally the arm broke off after about 200 or so shots. The rest needs a stronger spring and beefed up cradle arm. I was really dissapointed in it and I have two of their sights and love them. I went with the ZE this time.