I have been a long time user of Cynos Nano Color Shampoo and Conditioner. I find it keeps my color looking great and is easy on the scalp (I use it every day except on weekends!) I have never gotten a "build up" of residue that can sometimes happen with other brands. The Conditioner is excellent and not heavy for everyday use. Washes out feeling clean. I also use the Cynos Hair Mask shown in the picture weekly for some extra conditioning. I love the fact that they come in 1000 ml bottles with the pumps! I generally only have to purchase once a year from my Salon. Price wise they are actually really reasonable for a Salon Product.