BP&W’s are all I have ever used. Started diving back in 77/78 and used an old Sea Gill At Pac. I wore it out and "upgraded" it with a comfort jacket, padded straps, etc. It made the thing so buoyant that I had to ad extra weights just to get down. Sold it and bought a basic BP&W rig last year with a hog strap, stainless steel back plate and 20lb bladder. The only diving I do is during the summer in the Keys, and all I need is a couple of lbs of weights when wearing a shorty. Your right about them being effortless. That is what I have always loved about diving with one, and way I wanted to recapture that with my new rig.