Have only used it a couple times, but so far I'm loving it! I have light/medium brown highlights and it does take away the coppery colour (I used the shampoo and conditioner). Just be careful you wash it off your skin, as the colour in the product would definitely stain (it's really dark - way darker than I expected) - which is why it works great on hair.
(Not beating around the bush —this range is not good!) After using the shampoo within this range my hair was so brittle and dry, I tried using this conditioner in hopes it can untangle and nourish the ends that became so dry and it didn’t do much at all. My hair has split ends now and I definitely wouldn’t recommend it. The scent is overpowering too.