The carter attraction, evolution, and revolution (as well as the stan element) fire off of simple pressure. They have a safety mechanism that you either push or dont push (depending on the model) while you draw. Once at full draw you simply continue to pull through the wall and it will fire when it hits a predetermined weight. They are very very good training devices. I have one, and I have seen some very top level shooters struggle to shoot in competitions with them because as you get tired or stressed, you will sometimes pull differently against the wall. Great for training... would not be good for hunting in my opinion.
I think that the best hinge style release I have used (and am currently using) is the honey badger claw from truball. It has the same HT head as the original HT. It is very very easy to adjust. You can use a click or none, and the handle is tapered like the longhorn.
I have always liked the feel of the longhorn but HATED the adjustment with a passion. You unscrew that set screw and then it is a week of adjustment before you get it back to where wanted it. I never liked the feel of the HT but loved how it adjsuted... the new HBC is a combo of great feel and awesome head.
I kinda get a kick out of all of the "back tension is a style not a release" comments... I would wager than 90% of the people making those comments say they shoot "back tension" with a trigger. I have shot competitively for many many years and have personally struggled and watched many others struggle with shot execution... until you shoot a hinge thousands and thousands of times, you will never know what true back tension execution feels like. Slowly squeezing a trigger while pulling across your back is not back tension.... it is command shooting. There is nothing wrong with that, guys shoot amazing scores doing it. So while I agree that it is style of shooting and not a particular release, I do not feel that taking your old punch o matic and trying to teach yourself back tension shooting is the way to go. If theres a trigger, you will cheat at some level... plain and simple. Go to the hinge or tension type release, then go back and try to shoot "back tension" with your trigger.
Some of the top pros will even argue that there is NO SUCH THING as back tension shooting. Even with a hinge, the release has to rotate to some extent so there is some control.
Joe