The Scotts are great releases...the only thing I don' t like about them is the straight bar trigger. I prefer the Trufires as they have the curved trigger that simulates a horizontal rifle or shotgun trigger.
I use a Trufire X-caliper and bought 2 for extras in case they ever get scarce! I prefer this model because of the " release-to-fire" option. It makes it more versatile for spots and can help with issues of target panic if used properly. I have a Cobra as a backup as well and shoot with it about 1/4 of the time just for a change and to keep on my toes.