I have been having my long hair colored with INOA for over a year. I am 80% gray and due to the rapid growth of my hair have to have the roots colored every 14-18 days. I love the product as my hair has never been so soft, silky and shiny. On two occasions when my colorist was unavailable the gray coverage wasn't as good, so I am convinced some of the problems people are experiencing are due to the hairdresser not applying the color correctly. I should add that my hair only gets blow dried when I visit my hairdresser to have my roots done, I get it cut twice a year but have no split ends and my hair is in the best condition ever and I have been dying my hair for 30 years!