There is a huge thread on ADVrider, and some on badweb, where Blake poo-poos them because he personally can't wrap his head around how they work, so he slams them (WTF... oh well). I asked him to be open minded, and to have someone try them and report back, but he seems very close-minded. Indeed weird for a moderator on a forum.
All I have been able to find are posts from some guys saying they are great and work as advertised, and others not understanding how they work, so they reject the idea without even trying.
Bottom line: wheel weights are easy, cheap, work fine, always have and I guess they always will, and that's surely why big tire outfits and car mfgr's don't switch to them; but I like to open my mind to other, new possibilities, so I try to listen to any who have experience with them.