I have a Truball Extreme with Talon head I prefer the Talon head over the caliper head.

Another one I have is the Magtek 4 finger another great release that gives you a surprise evey time it fires because you just dont know when that magnet is going to break over, another good thing about the Magtek is zero trigger travel and if set correct no miss fires if you have to let down even if you have had pressure on the trigger.

Just remember tho with any of the thumb style release when you draw the bow make sure your thumb is pointing down and no where near the trigger cause the resulting punch in the mouth hurts and can knock out both teeth and the user