My hair tends to get tolerant to many shampoos and other products. I can usually get through an entire litre of the shampoo (and conditioner) while still having noticeable volume in my hair. I often switch it up every other bottle just to keep things fresh, but I absolutely love coming back to this set. I usually pair it with the Your Highness conditioner and Queen for a Day thickening spray.

The scent on this is incredible (like all other TIGI products).

This was in my Christmas stocking this year, as well as the conditioner!
Definitely a good product in my opinion:

-the first thing I noticed was the scent (that's always important to me!). Your Highness is supposed to have Lavender, Jasmine, Wisteria & Violet, and it honestly smells like heaven! I love it. Such a luxurious scent, and not too strong.
-as the product claims, it really did give my hair extra volume. My hair is kind of thick to begin with, but I noticed a difference in the volume, and even after not washing it for a day.
-it cleansed really well, and the packaging is great too (the bottle has a pump, and I totally prefer that to fumbling around with a huge shampoo bottle!)
-it's sulfate-free, and I'm sure that's a good thing :P

The only complaint I have, and that I have found with another TIGI shampoo (pretty sure it was the oatmeal one), is that the texture of my hair feels a bit different after washing it, and it's harder to brush through while it's still wet. Aside from that, I really like this product (especially the SCENT!)