I only had great experiences with JMK before, and just assume that BMW owners are treated the same way everywhere. My brother had his 330 he bought used elsewhere repared at JMK and also had no problem getting a loaner. He got a bright red 328 coupe.
Having a bmw loaner is certainly nice, but I would not mind a rental, LifeQuality refused to provide any help, and I had to pay for rental myself.