The main reason I like to dive a BP/W is to get better weight distribution when I am diving dry. I use 20lbs +/- of weight, so with my BP/W that drops to 10# or so depending on my exposure protection.
When I travel, I use a travel BC (Zeagle Stiletto).
For whatever reason, most that dive BP/W's are bit zealous about that choice. I'm very positive that packing up my 10#+ BP/W is going to contribute to additional baggage weight, and not really impact my diving one way or another. So I leave that at home, and take a lightweight travel BC. With 3/2 exposure protection, I don't wear more than 10# total weight, and I could likely get by with less.
My opinion on BP/W's is that they work great especially when one needs to use a bit of weight, but don't dive that much different using singles vs. a good back inflate BC.
I agree that the Ranger's bladder is overkill unless you are a really big dude. I started out with a nice used Ranger that I got on the cheap, and replaced it with a new Stiletto that I got on the cheap!
This Board is likely the best thing that ever happened to the BP/W manufacture. However I'm not sure they are any better for single tank diving vs. many Back Inflate BC's on the market.