PostureTek Biofeedback shirt

Ok, I admit it, I am a sloucher, too much time spent bent over a keyboard, and my slouch seems to be getting worse as I get older.

I was bored on my last flight and found this thing in the skymall mag:

Its a bit pricey for what looks like a fitness shirt with a small plastic thingie that vibrates. Reviews are scarce, has anyone here tried it? Is anything from the skymall mag ever worthwhile, or is it all just junk?