Just used the dark chocolate brown one on my medium brown hair - wow! I have never used a hairdye that foamed like that before, it was so so easy to use and my hair looks really healthy now, and a lovely colour, not too dark like a lot of dyes I've tried. I only bought it because it was on offer, and I'm converted.
I'm also probably wildly behind the times and you all know already, but I thought I'd share just in case!