I've used the Color Prepare treatment on myself and have to say it has always helped me get great results. But my most recent experience using the Color Prepare Treatment was actually with a friend. I was coloring her hair for her and where she lives she has very hard well water. Her hair is thick/coarse with faded/dull light brown/dark blonde color with some gray roots, so I was nervous about the haircolor adhering and coming out evenly. In preparation, we used the Malibu C Color Prepare Treatment packet first, like the directions state. We were both overjoyed with the results! The color came out so rich and beautiful and (what I was most concerned about) the color was even throughout the length of her strands - zero brassiness! I was already a fan, but now I'm hooked! I won't go forward with any haircoloring without using this product to prepare the hair first!