My MS arrived just before LTE connectivity became standard. So after receiving a referral credit and seeing that LTE upgrades were available I rang the local (Salt Lake City) service center and made an appoint for a few days later to get the upgrade. Dropped off the car yesterday afternoon and picked up a loaner. Received word this morning that they'd finished the upgrade a few hours before I was expecting so headed back to the SC and immediately ran a speed test to see if there was much improvement. There was a lot of improvement with download speeds 3+ times faster than before. A couple of test even showed a 6x improvement. So, a bit pricey (what Tesla accessory is not ) but I'm really liking the extra speed. And kudos to the SLC SC for getting me in so quickly and getting the job done ahead of schedule.