In Reality, I know squat all about BJJ, but I've been told some of the major differences from judo are

Positional dominance
rules
transitional flow

Hey Bob, I wonder what ever happened to Frank Benn? He was a stalwart on the old rec.martial-arts, and I really liked his posts, even when I disagreed with his opinion.

Sounded like he was a monster in the dojo too, which never hurts!
Best,
Ron