I bought a set of tires here on xoutpost and had my BMW dealer install them. Price was reasonable and they seem to have done a decent job except for one thing -- they had marked the edges of all the wheels with what looked like rubber abrasion from the mounting/alignment equipment. I had to use 4 different cleaning compounds to remove that. Normal wheel cleaners could not remove it.

So maybe they don't have the best equipment for wheel mounting and balancing? I don't know.