"GREAT" whitening product, I can't stress that enough. I don't know anything about shades but I know I went from looking a little yellow to looking like straight ivory. By far my favorite whitener out there.
I've used crest whitening, I've used those whitening lights, etc and all of them make my teeth VERY very sensitive. I don't know if I'm just a sensitive person but those were unbearable. Idol White whitens my teeth wiithout as much of that feelling. I still get a little, but not nearly as much as the other treatments, and I think Idol white even whitens better.