I've been very very happy with the BZ400 that I have. I received it back in August, 2006 in preparation for an expedition to the Empress of Ireland. I was able to stay warm in 35-37 F degree water for a change. 6 months later, I'm still happy with it diving in Massachusetts during the winter scootering in 36 degree water. My fingers were frozen, but my body was reasonably warm. I might consider getting the vest at some point. It might make things even more comfortable.