Review (5/5): Love it, very vivid hot pink
I used the Pink Fetish for several years and loved it. My bleached hair (normally medium brown) was a vivid highlighter hot pink that did not fade. I had 4 inches of dark roofs and the pink was still as bright as when I applied it months before. Even bleach couldn't get rid of it completely, so if you want something temporary then maybe this is not what you need.
Pic with blonde roots is after bleaching my whole head to do my roots (because I'm too lazy to just bleach my roots sometimes) you can see how the bleach hardly made a dent in the color. Second pic is freshy fresh day after application color. Pic with dark roots is after a couple of months, shampooing every three days or so with gentle color safe shampoo and conditioner, fading is pretty minimal. The last pic is after a very hardcore bleaching, it got most of it but I still had pastel pink highlights.
It will continue to run in the shower for weeks, though I didn't notice any staining on my bedding, but all of my sheets and pillowcases are hot pink to start with.
Anyway, this stuff makes your hair bright pink, but it has to have a pretty light base, so lots of bleaching. I don't mind dark roots, so I was able to go 4-6 months between touch ups. It has a pleasing scent, and is super easy to use (the bleaching is a pain, but the actual coloring requires no mixing, just pour it on and wait. It will stain your scalp, fingers, ears, and hairline if you aren't careful. I found that my neutrogena exfoliating face wipes took it off fairly easily.