I had a good experience today with Tesla mobile service installing a FSD hardware upgrade on my 2017 AP 2.0. Last week I got a message on my mobile app and an email stating that I could schedule the upgrade. I was surprised that the upgrade was offered with mobile service. The mobile service tech arrived this morning from Knoxville, TN. He said I was his third upgrade and that mine went relatively smoothly. It took 2 hours for the service, most of the time was waiting for software to download. I was told that I will not be able to use AP until the cameras are calibrated which can take from 15 to 100 miles of driving. The tech said I would have all available FSD capabilities and that I do not have to upgrade to MCU2.