I am always on the search for a Bumble & Bumble shampoo I actually like! I am a fan of their conditioners and styling products. However their shampoos have so far been a disappointment for me. I tried the Tonic shampoo because it is supposed to be good for dry scalp/dandruff, and in the winter I have trouble with dry skin. The tea tree in this is supposed to be effective (and I like tea tree products anyway).
Pros: I like the smell of this, though I am sure others would find it medicinal. I like the small of tea tree, which is definitely strong in this shampoo! I also found this to do its job as far as cleaning my hair. I would follow this with B&B's leave-in/rinse out conditioner (which I would usually rinse out).
Cons: This shampoo is both too harsh and also not ultimately effective. It cleans hair but is a bit harsh: it had a stripping effect and felt like it was harsh on my hair-- and I have very healthy, undamaged hair that can stand up to a lot! I sometimes conditioned twice in order to make up for it. I have seen other users say they use this in rotation with other, gentler shampoos, which is probably the only way that anyone could use this regularly. On the reverse, I also didn't think this was effective at combatting dandruff or a problematic scalp. This didn't help with my winter dandruff, nor did it control my oily scalp. So, it was lose/lose for me.
Overall: I would not repurchase. I didn't hate it so I didn't return it. I will use it in the summer until it is finished! As I mentioned, I like the smell; but this is too expensive to not really DO anything productive for my hair or skin.