I also have about 150 dives on my Balance. Much less restrictive and much more streamlined than a jacket. I would buy it again with no regrets. Sometimes the pocket space becomes an issue but I don't like to carry a lot of stuff anyway. I never really noticed the tank shifting but my Balance fits me a bit on the tight side. I like it that way. I put 4# in the back and the rest in the ditchable pockets. Back inflates do tend to need less air at the surface if you don't want to float face down. Other than that, I didn't have any problems with the transition from a jacket to a back inflate.