You can a Pro Diamond Xtreme for about $75 which is half the price of the Carter or Stanislowski (sp?). What's the difference for hunting?
Proper shot execution has your conscious focus on the spot you want to hit, and a subconscious shot execution of the release. It's awfully hard to do this and maintain the proper focuse when using a release that has movement in the release mechanism. The difference your going to see between a low en T.R.U Ball Pro Diamond Xtreme, or a top end T.R.U. Ball/Carter/Stan is a drastically better trigger mechanism. The top end T.R.U. Ball/Carter/Stan is going to have zero noticable trigger movement, and will break so crisp it's like breaking a glass rod. The lower end thumb triggers are going to have a lot of slop and trigger movement in there.