Ditto,
I use the same product, even though I don't color my own hair anymore. When I wear blonde wigs, I always bleach my brows. Haircolor alone won't usually get your brows light enough, you would have to use bleach if your hair was lighter than dark or med. brown and you wanted to match it.
I think it really completes the look, and makes it look more natural.
I have also seen people who have dark hair and lightened brows. The make-up artist Sam Fine does this all the time, and the women look flawless.