well, supposedly Jessica Simpson's stylist uses PSSSST dry shampoo on her.
I bought some of this to use, it works okay for me for about half a day, but I can get a really oily scalp, so I still just wash every day. That women can go 2 days or even four sounds more like fantasy to me than reality.
My sister has also used PSSSST and she likes it, she has less oil build up than I do.
PSSSST also, kinda lifts your roots and gives a little extra body as well.
I think the B&B stuff works but is way expensive.