Nice move ditching the shaving cream :) If in doubt, I would tend to assume any health and beauty accessory is a myth that we just got used to and don't really need.
I'm in the lunatic fringe with this stuff and don't even use shampoo. I implore everyone to try it, and give it a solid month or a few months. You just don't need it when your hair stops depending on it.
Cavemen didn't have no shampoo. There's no reason our hair needs some sort of bottled product to be healthy. (Quite the opposite, it's probably making it less healthy.)
(I posted this from Starbucks tho so what do I know)
I've had friends recommend this as well. Maybe I'll try it some day, but I like my shampoo too much to stop now :D
Get the heck out of Starbucks and start brewing your own coffee by the way. You'll thank me later.