The 'jacket style' is used in my classes.
I read that the 'back filled' ones are more comfortable,
but have a tendency to put the diver face down
when at the surface.
Oceanic's Chute-1 has two weight pockets near the back
(each of which can hold a 4 pound weight)
which are supposed to provide 'for better vertical stability'.
Has Oceanic fully solved the problem?
Or is it safer to use the 'jacket style'?
I know....I ask too many questions.....but I'm a newbie!