I recently received the same service at the Chicago service center. I was driven to work in a Lincoln Towncar. Later that day when I wanted to pick up my car they did not have the limo so they offered me a car from Enterprise. I refused and took the bus. Sorry guys, I am not going to drive an ICE!
I know a guy with a Tesla limo service in Chicago, so I suggested to the service center to use a Tesla limo service. Would be much more appropriate, I think. For now I agreed with the SC to always schedule a service with them when a loaner is available. Most issues do not require immediate attention, so I am happy to schedule around their schedule.
By the way I have been at the service center about 5 times since I got the car. My MS was hand washed every time. Love the service.