Review (5/5): Splat is PERFECT for the casual hair-dyer.
Green and purple fade quickly. Blue and red last. I'm a brown-haired dude who has very little experience with hair dye; I ordered four colors and went wild. It was incredibly easy to use and I love the way it turned out.
Bonus: The dye itself lasts a while if you store it well. I seran-wrapped the bottles and screwed the caps back on. Two months after initial use, I am re-dying my hair :) I am only doing sections of my hair, not my whole head, so when all's said and done, I think I will be able to keep my hair dyed four different colors for a whole darn year, perhaps far longer, for like $30. This product is a definite buy; but if you're like me and you would rather touch up your hair bi-monthly instead of bi-weekly, pick a color that will last.