I know that anecdotally, there seems to be a lot of positive feedback on various beauty blogs, but I've read quite a few who've said they see no change.  Does the Invati system really work in helping you lose less hair and grow thicker hair?  And is it really essential to use all three products (shampoo, conditioner and revitalizing treatment) like Aveda insists it is?  It's a lot of money and I want to know if scientifically, it's legit, before I drop $108 or so.