I bought the small size of the shampoo and conditioner, but I will soon be buying the huge bottles. This stuff is amazing! My hair took a lot of damage from Pantene, and when I first started to use Redken (first 2 times) my hair felt stripped of the coating that Pantene left, so it was not as smooth as before, but a lot lighter. Now after 5 uses my hair is nice and soft and smooth. I can't believe I can actually really "feel" my hair again, instead of having it coated in wax (Pantene). BTW, I have normal, slight dry hair which has been coloured many times b4. All Redken products are suitable for coloured/treated hair.