I have eagle 100mm wheels and they are awesome - proto grippers don't even compare in my experience. I've ridden them since september, and other than mild discolouring they look bran new.
I've never had any problems with eagles but my friend chuncked his slider in about a week and then the metal inbetween two spokes near the uerothane bent in and rubs on the fork. I've never seen a wheel break like that.