Reserved XCAR (BMW 5 series), received BMW 540i xDrive with 25k miles. Car was loaded with the Driver Assist package, & Excutive package. Car drove itself on the highway (had to grab the steering wheel every few seconds though), & also parked itself. 540i had noticeably more power (0-60 in 4.4 seconds) than the 530i.
Was offered a X5 for an additional $20 per day, or a X7 for an additional $90 per day (I didn't attempt to negotiate though). There was also a BMW X5 M60 on the lot. Upon return, there was a Mercedes Benz AMG GLC 43, and a MB G Class