arieng - 8:57 pm on Jun 16, 2011 (gmt 0)
I've had some success with it, but not on the AdWords platform. The way we were able to increase our performance was by segmenting our ad creative and our offers. Generic brand-related offers didn't do very well, but conversions improved when showed an ad and an offer that were relevant to the types of products the user was browsing on your site.
I do agree though, as a consumer I find them creepy.