I bought the Trap Door Arrow rest about a year ago and went through last hunting season with it. I have had nothing but problems with it. The concept was somthing that appealed to me as i was talked into purchasing it at a local bow shop. The rest involves no strings and is totally inertia driven, before shooting you must prop up the launcher which is then dropped.Last Season the rest failed as it would not rise up to hold the arrow during a prime day during the rut in early november. I called the company and said that the rest was set too sensitive and parts shrink in the cold. This summer while shooting 3d the sensitivity was once again affected by the heat. This rest is nothing but trouble i give its design and materials two thumbs down. BEWARE OF IT. I currently have it packaged in a box with all the nuts and bolts to send back to the company to do with it what they want because i wouldn't even let my little cousin put it on his starter bow. Total Junk..