I have a slightly different perspective than other people--I started out diving with a Halcyon Eclipse in my basic OW/Nitrox course.
I had probably 30-40 hours of pool time in it and then had to go rent my own equipment for checkout dives (university wouldn't let you use their equipment on their checkout dives--wanted you to experience a dive shop).
Boy was I in for a surprise...I didn't even know a jacket-style BC existed--a bp/w was all I had ever known! (pointing to the cummerbund-"What the heck is that?" and "This thing doesn't fit!" and "Why is there only one tank strap?" etc) I didn't enjoy the experience at all.
We then went down to the keys to finish our dives and to have some fun dives--again I was rented a standard jacket-style BC. Not the best of experiences.
I worked in a dive shop that summer and whenever we went out on dives I used the shop's rental stuff--jacket style BCs.
After all that I eventually ended up buying an Eclipse. I enjoy how stable it feels in the water. Granted you can be perfectly horizontal with good trim in a jacket-style BC but I just prefer a bp/w setup better. They have everything I need and nothing I don't. I don't need lots of pockets--everything I would need in an emergency situation is within reach--bungied backup, backup lights, etc. I have one DiveRite waist pocket that goes through my waist strap on my right side and that's used to hold my wetnotes and some shears and to route my long hose (I'm too cheap to buy a canister light).

Some people complain that the bp/w setup is frustrating to adjust. Try it a few times and it becomes second nature. And besides, how often do you seriously have to readjust it? I might loosen the strap when I go from a 3mm full to a 6.5mm two-piece, but that's about it. As to the straps being uncomfortable--you shouldn't really have to deal with them being uncomfortable in the water, especially in an exposure suit. On land they might pinch a little, but that really isn't where they matter--walk to the water and hop in if they hurt--why are you standing aroud anyway if you have a tank on your back?!
