I have a few random ones that were gifted to me, but I've never gone out and purchased any as I really don't care for them. Those beady little eyes coupled with the complete lack of expression just doesn't do anything for me.
Oddly though, I loved one of their predecessors, Mighty Muggs. While they did all have the same mold, the deigns on them gave them character. Out of the two dozen or so of them that I have, I'd put Revan and Dr. Doom as my favorites.