The GAT, while being a little gimmicky(like all of the trigger add-ons), works the best of them. I tried a Tac Trigger, a Tri Burst, the HellFire and the GAT was the only one that worked without breaking first use. In fact, after two years of sporadic use, my GAT is still going strong on one of my ARs.
Takes a little getting used to, but the advantage is that you get to keep very good control of your weapon with both hands.
The others use a method whereby you have to hold the weapon loosely, and let the recoil action "rock" the weapon against you finger. Thus, the videos often show firing from the hip. This is almost impossible for most people to grasp how to do, never mind to do it! It also gives you the sensation of being out of control of your weapon, and it almost impossible to aim anything when it rocks!
The GAT provides the firer with a better sight picture (read=more stable) due to the fact that you hold the weapon in a more natural firing position and it flat out works for anyone who can figure out how to hold the weapon and spin the dial with the trigger finger. (If you can pat your head and rub your tummy at the same time, you can use a GAT!)
Tom
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A "Miss" is the ultimate overpenetration!
You can never be too rich, too skinny, or too well armed!
Wake up and realize that you have the moral imperative of action..!!!