I like Nutrisse (it turned my hair purple the time I used a color called "Eggplant" or "Black Cherry" - can't remember exactly, but never have had another incident with using browns). I tried the new Olia and that is now my favorite. I have tried almost all of them on the market since I have been coloring my hair for about 40 years. Some color the gray but leave my hair stiff and dull. I have used the 10 minute ones and they do color the gray but I don't like the feel of my hair afterwards. I'm going to stick to Nutrisse and Olia from now on.