So basically AC+1,except the +1 is a random slot somewhere 6 points above your AC. Yeah, I think this item would be annoying to use, and probably isn’t as good as just AC+1, because your AC should be somewhere near where enemies are hitting ideally, or you shouldn’t be getting attacked at all. 6 points higher might be out of their range to even hit.
So basically AC+1,except the +1 is a random slot somewhere 6 points above your AC. Yeah, I think this item would be annoying to use, and probably isn’t as good as just AC+1, because your AC should be somewhere near where enemies are hitting ideally, or you shouldn’t be getting attacked at all. 6 points higher might be out of their range to even hit.