All the release above are great. But the only back tension releases are true back tension release like the stan shown, no trigger at all. The rest are a form of a trigger release, and you can punch them all or use back tension on all releases. Its a technique if your release has a trigger, and there are plenty of articles explaining how to use this technique. Sorry to rant but I hate nothing more then hearing "look at my new back tension release" and the guy pulls out a thumb trigger release just a pet peave I guess.