My first BC was a Diva and before I had 20 dives on it, I knew I was unhappy. Not only was the "bra thingy" completely worthless for me, but the bulkiness felt like it hindered me constantly.
I did a lot of reading and research, and was seriously looking at the Transpac for my new BC. It was about that time when my LDS got a Zena in stock, and I knew the minute I saw it and tried it on that I had found the BC for me. I love it's minimalist design, the wing style, and how the bodice (corset) fits so beautifully when adjusted and fitted properly. My BC and tank never move on my body when I'm diving, and frankly I never have to waste time adjusting it at depth or while diving at anytime.
For me, if there weren't a Zena, I'd go with the BP/W.