Idecided to try this out. I was using Wella and always had good luck, but this sounded promising.
I went through their process of determining what would be my "formula".
After following their steps, my roots were a reddish medium brown and the rest of my hair was my natural dark brown.
I was heading off on vacation in less than two weeks, I called and complained about this result and the customer service rep was extremely rude. She didn't offer a solution that would make my hair normal before I went on vacation nor did she agree to honor their guaranteed money back. I went back to Wella and would never recommend this company to anyone who cares about their hair.
Monetary Loss: $20.