Very easy to use and no chemical smells. You know what you are putting on your hair is natural and not going to damage it in any way. Having been through chemo a couple of times and been left with very fine thin hair, I wanted something that would cover the grey bits but not damage either me or my hair. There are lots of shades to choose from and finding one to match my natural colour was very easy. I have just started on the 6 weekly subscription which is great as it gives me a reminder without the hassle of re-ordering myself. Would definitely recommend.