On some girls, I've seen them work very well but like anything else, it's how it fits together with everything else that determines whether it works or not. So although I can't say one way or the other in every case, more often than not, I like 'em.
What I think is that if something makes you feel good, that matters most of all. Not just in a "be happy with yourself" way, but I also think that when you're happy and confident and you feel cute & sexy, that makes you look cute and sexy to others.
Plus I think they're cute if you have the right look and attitude for them so go for it. :-)
Just beware you might have too many nerdy guys drooling over you if you ever call yourself "nerdy."