I also refused. It didn't make sense for my character to join them, even if you get a cure later on. The only annoying thing is guards will comment on you "fetching the mead" with the companions for the rest of the game.
You are still "fetching mead" even if you are the Harbinger. I think guards are just dumb in this game and don't realize that something changed! LOL
I won't even join the companions with my current character. I never liked being a Werewolf and I never changed to beast form when I was one in previous playthroughs. Plus, you can "cure yourself" pretty much towards the END of the quest line. I rather get the well rested bonus!




