Absolutely LOVE PreChek. Best $85 i've ever spent. We fly in and out of Orlando several times a year .. and that airport's regular security is always a congested mess. But PreChek whizzes us right through in minutes. No belt removal, no shoe removal, no computers outta bags, no getting barked at by nasty TSA agents .. .. its just a much more civilized experience. 3-oz. rule does still apply, though.
Ive used it at airports here in CT and NY too as well as others in Florida and its always great. It's worth the little bit of work required at the beginning .. (on-line application and visiting a TSA office for fingerprinting and background check, etc).
Do it .. .you won't regret it.