I just found this thread as I recently did get my Android Auto Wireless dongle and made a guess that my Discover Pro is a MIB 2.5 unit, and it seems to be working well. I then did a search for MIB 3 and found it is the same essentially from a user view, but has the Wireless App Connect. I was hoping my car last year would get that but in Australia we got the 2.5 and USB A ports, while I saw the NAR market was getting the last of their 7.5's with USB C, and maybe MIB 3? Does a USB C port in the console denote MIB 3?
I did get a play of a MIB 3 last week as my mother is buying a Skoda Kamiq. The 2020 model we test drove didn't have Wireless App Connect, but the 2021 model did and it was very cool. She'll also have wireless charging so she is all set.
Now with the Wireless Android unit my need for MIB 3 is pretty negated considering the cost. At the moment in Aus we update our maps (that I don't really use) via an SD card slot. I have all these slots in the car I don't really need or use, but it's nice to have options.
Phone power is an issue running wireless, but mainly on longer trips. My phone is setup to provide a hotspot for the car and the kids to use and gets hammered, so at the moment I'll be plugging it in to power on long trips, but around town, and often by myself it's fine.
I am back to looking for an elegant wireless charging solution as I bought a nice setup to attach to the drivers side vent with a new charging holder but that all went out the window when I got a P3 gauge that sits in that spot. Easy to buy what I want from Ali Express for a LHD car, but not RHD.