Hey, Minnesotans, I'm from Afton, and I've used Protech in the past as well. I agree, they're very nice and possibly a bit more cautious than some of the other dive masters. (they're the British group, right?)
We now have a condo at Belizean Shores and so we've been using Belize Ocean Divers, also good. they certified my daughter, they're very flexible and go out in small groups. A bit more relaxed, possibly.