Preface: I am using the entire system, shampoo, conditioner and hair booster/protector and have been doing so for about 2 weeks.
I love this shampoo. It's not super-sudsy but nor do I feel like my hair has been stripped of all life after using it. The tea tree oil give a nice tingle to my scalp. My hair is left feeling clean but not dry. The smell is lovely but kind of like a men's cologne. The smell doesn't linger for long.
Overall, after 2 weeks, I am beginning to see a difference in the amount of hair I take out of the shower each morning.