It's run by the Mancuso group:
http://www.quiltfest.com/activities.asp?id=36
I'd say it's bigger than the Edison NJ show (usually held in March?), but has some really high quality quilts and a good vendor mix.
Some of the Fla entires have gone on to win at Paducah and Houston.
I didn't think it was as big as Pa Expo (if you've been), but definitely worth the visit.
Most, not all, local guild shows in Florida are usually held Jan-March.