I think if you are really ashy blonde and you want to stay ashy and super light then this is the shampoo for you!!
I have used this product for the last 6 years, and have tried others in between as well but I always come back to this one. It smells great has an amazing pigment and really banishes brassiness. My hair always feels clean and soft after washing with this shampoo and I have made many of my blonde friends try it as well.
I've just recently brought this after hearing good reviews. I am not blonde but do have balayage highlights in a caramel/blond shade. This took any brassiness out and refreshed the light shades making my hair look like it did after leaving the salon. It also wasn't drying, I have used Joico purple shampoo in the past and it made my hair feel like straw, but this left it feeling so nice!