Soggy:Come to New England or go to Cave Country and you'll find most people doing any sort of technical diving are using Jet fins. If they work in the most demanding environments, they'll certainly work well in the easy Carribean open water environment.
Actually in Cave country, it's about 75% Jets and 25% single flat blade (Dive rites, quattros, OMS, etc... ) and I'm in cave country every weekend.
I believe that it's due to the sizing issues if the Jets, as some just don't fit. But I still see very experienced divers diving fins other than Jets. It all comes down to personal preference I guess. Nobody has the exact same kick, therefore no 1 fin is perfect.
Cheers.
Mike