I just dyed my hair about two weeks ago, so I can't yet really report on longevity yet, but I love the color & dimension it has despite the fact that my hair was pretty much flat platinum when I dyed it. I didn't really rinse well when I first dyed it, so it lightened up a bit with the first few washes. It is a great steel-y grey! I bought mine on Amazon here. It was under $7 when I ordered, so you might want to keep it in your cart/price watch.