There is a noticable difference, more than I expected actually. It's quicker to rev and drop rev's as well, shifting from 1st to 2nd and then 3rd seems a good deal quicker. Downshifts from 3rd to 2nd are noticeably quicker as well.
I don't feel any difference anywhere else, but that is more than enough, I can row the gears up a lot quicker than before.
Or it's the placebo effect and it just gave me more unfounded faith in my shifting abilities!
I do think it was actually worth the $90 I spent on it, and red is just cool anyway!