I purchased and used this product specifically to try for LOWLIGHTS in my hair, not all over colour. I thought I would share my experience in case anyone was thinking of trying the same thing. I used 6WN - light chocolate brown. My natural colour is light brown mousey on the warm side, with some silvery grey. I don't do all over colour - in the salon I get highlights/lowlights. I got this kit to tide me over because my girl was all booked up and I *needed* a colour boost for an upcoming trip. I picked this particular kit because of the comb applicator. My plan was to just 'streak" some colour through my hair with the comb, and just let it sit like that (rather than following the instructions and mixing it all through my hair).
Generally speaking, the process was easy, and my hair turned out well conditioned. I DID achieve a lowlight look. Although I just "streaked" the colour on, I still seem to have ended up with a lot of my hair coloured. Some of my old highlights and my grey streaks still show through, which is what I wanted. (My highlights are about two and a half months old).
In some areas (virgin hair/roots in particular) I got a definite red coming through. I don't mind that because I know my hair has that "lean" to it. I also know that in my case, this red effect tones down very quickly. It's not an issue for me but I mention because it may be undesirable for others.
I gave this kit four stars because it did what I wanted. I knew I wasn't going to get quite the same effect as salon foils so I didn't have super high expectations to begin with It is also just a "tide-me-over" for a month until I go for my usual highlight/lowlight at the salon. So, all that considered, I'm happy with the result.
For what it's worth, once I had the colour on I got completely terrified that it was going to look horrible (I was not using it according to directions after all, so no one to blame but myself if it bombed).... so yes I definitely had my moment of panic. However it did come out acceptably well for me - no tears, no emergency calls to the salon! (I don't normally write such long reviews but I wanted to describe my experience for anyone who was thinking of trying the same thing).
Oh, and I indicated that I would not purchase again, but that is only because I normally don't dare colour my hair at home, and I don't plan on doing this all the time. (I posted some photos of during the process and the after result on my profile page, for anyone who wants to see the outcome).