After three shampoos/conditioning, my gray hair is silvery bright, not faded yellowish silver. The product is expensive, but you don't need to use a large amount. I do leave both the shampoo and conditioner on for 3 minutes each before rinsing. A little extra work, but the result is striking silver hair. It looks much classier than the yellowish-gray.
It is expensive but it lasts for a very, very long time. Works great on your hair leaving it shiny and healthy looking. It definitely helps keep my color in longer.