Bob,It's been about a month since I scheduled the MCU2 plus radio upgrade for our 2017 S. The original appointment was last week - which Tesla rescheduled because they didn't have the tuner. They're still waiting for the tuner.
It's well worth the wait. But as Tesla owners, we want our stuff yesterday!
Another benefit is the 5GHz wifi. My MCU 1 would always disconnect from wifi and sometimes wouldn't even see the access point (about 10ft away). The dashcam/sentry viewer is pretty cool too.