Got the bladder for my 16m Cab SB from Jim at www.kitebladder.com
today, and it was a huge success. It's built exactly the same as the OEM bladder, and the PU material feels as good as the original bladder. It had the original Cab connector, and the installation took about 10 minutes.
I inflated the kite, pinched the replaced strut bladder off, and deflated the rest of the kite. After 2 hours, the strut was still rock solid, so I would call that a win!