I have moved from a Mares Frontier WI to a DUI Delta back inflate bare bones fully adjustable WI BC. It has taken some time to get used to the back inflate style, face first push at surface, but my LDS instructor gave me some hints to help this. I enjoyed the jacket style very much, but being a big guy, I didn't like the pressure (when inflated) on my stomach/chest etc. I really find my underwater postioning is now excellent (feels that way, don't know what it looks like). So I believe some will evolve to the BP/harness, back inflate or stay with the traditional jacket style. It is personal preference and as long as we are all diving safe...who really cares what we wear??