I used the Nice N Easy one. I usually have a problem with hair dye fading out really quickly (not due to gray though, I'm only 22 lol). The color is still sticking around a month and a bit after I used it, just waiting a little while for the next application to avoid roots on my trip. Be aware though, the foam STAINS like crazy, so if you get any on your face or ears, etc. clean it up right away. Also, I usually use a bit of the leftover color to do my eyebrows, but with the foam it colored the skin behind my eyebrows more than the eyebrows themselves... Overall though I liked it enough to buy a couple more boxes to hold onto. Just won't try to do my eyebrows again lol!