Personally I think almost everyone that saw it said "that's just wrong" in their heads.
The cruiser riders think the whole BMW thing is weird. They don't get the marque, usually.
The non-cruiser non-BMW riders don't get the C because they don't get cruisers, and they also don't get the Boxer engine.
The BMW riders wonder why they'd want a cruiser in the first place.
It really seemed to answer a question very few people asked, I think.