Bec, this is what swayed me into the Mooncup - I nearly went the Keeper until I started to read about allergies. I don't think I have an allergy now, but that's not to say that after exposure to it I wouldn't develop one after a while.
I still love my Mooncup...3 months on! I just think it was such a positive way to await the return of my period after so long not having it after giving birth