They're as legit as any of the others, take that for what you will. 3 of the current Ring champions are WBO champions (Joe Calzaghe, Jermain Taylor and Hugo Cazares) and they haven't done any silly bollocks like the WBA did with the super champions, or almost bankrupt themselves by stripping a guy of a belt he won to give it back to another guy after he decided he didn't want to vacate it after all like the WBC, so I don't see why not.