LOVE THIS STUFF!!
It really does get rid of the brassiness & yellow. It's great to use inbetween colorings (until the next time you color in 6-10 weeks).
CONS: It only goes for like 2-3 days & the brassiness comes back and/or it gets a little dull.
PROS: Can be used at least 4 times a week or how often you wash your hair.