Pro's? I suppose excellent stabilization.
Con's? They don't appear to have much in the line of dampening capabilities, but then again, shot dampening/quietness can be achieved in a variety of ways other than your stabilizer. Heck there's plenty of people who shoot bows at shops while testing without one on, and they're still reporting positives in terms of noise.
People over on AT swear by them (B-Stinger's that is). Me? I think they're the most hideous looking stabilizer EVER. Then again, if it works, does looks matter much?