Well I hate it because I am trying to have the darkest possible tone in my hair and I love the blue tone of blue black.
When I used Unnique advanced (which has a lot more f/hyde) I had horrible fade, I went from fresh blue/black to dark brown whit lots of red highligths, so I gave up this treatment.
Maybe it is correlated to the amount of f/hyde....
I would do a semi-permanent but it fades really quikly
Aphro, do you think kerapremium has the same effect as QOD on color?