ORIGINAL: Sniper151
For someone switching from fingers to release I would suggest the Spot Hog, Cascade model 10 release. This release is activiated by releasing the pressure on the button. When a full draw and on target you depress the trigger. When ready to release you relax on the trigger and the release will activate. A quality piece for around $100.
Sniper,
It's the Model 8 Cascade that is released by relaxing the thumb. The Model 10 can go either way-----push or relax. I know . I Have two of each.