If you don't have particularly tangly hair and just want to try a new kind of hairbrush, the Goody Tangle Fix could do just fine. But a hairbrush is something you'll be using regularly, and especially if you have unruly hair, it should be something that does the job well. I say spring for the extra nine dollars and get a brush that does something special, instead of saving a few bucks for an unworthy imitation.
Nice try, Goody, but you've only proven that the knockoff will never be as good as the original!