This is a my next must have option! Did you compare it to Naviplus? What made you buy this one over the other? Can you control the volume control and calling from the steering wheel? I think that was one of the issues with Naviplus, but not sure on that. How’s the clarity with handsfree mic?
I've been planning to buy the EC unit since the first reviews popped up on this forum, but waited for EC to fix the bugs that the early adopters ran into. I had looked at the Navi, too, but got the feeling that it had more problems and worse support. And the EC unit also can act standalone with apps installed directly on it, which I also wanted.
My phone is Android, so if you're using Apple you might have a different experience.
I did not install the microphone that was included with the EC unit. My phone still auto-connects to the Toyota Bluetooth, and calls / microphone still work through (through the Toyota mic, I guess). The EC mic would be needed if you don't keep your phone connected to the Toyota Bluetooth.
When NOT using Android Auto, but still in the EC unit's screens, all the steering wheel call buttons work as intended, but a call will switch the screen back to the Toyota screen. Alternatively, when using Android Auto, the "pick-up call" steering wheel button doesn't work, but a pick-up button appears on the screen that works. The "hang-up", volume, skip buttons all work in any mode.
I don't know if voice commands will work without the EC mic, I never really use voice commands for anything.
Music audio quality is good. Phone audio quality is just okay, I don't think it's any better or worse than normal.
There is about a 1-second delay when someone talks and when the person on the other end of the call hears it. I don't know if that's a problem with the EC unit, the Toyota system, or Verizon. In the EC unit's System Settings screen, you can choose mic source from "int", "ext", "oem". Switching between these doesn't seem to change anything, except that "ext" has slightly less lag.
Overall the system is working better than I expected, except for the slightly clunky nature of phone calls that I mentioned above.