I bought the MA1 unit a couple days ago and used it on a road trip this weekend. Very happy thus far.
I bought it because no matter what USB cord I previously used, my phone would often disconnect from wired
Android Auto, especially if something cause my phone to move. It even happened when my phone was perfectly still in the car. It got really annoying. I was hoping the issue would be rectified by this wireless system and so far the issue is gone. Drove about 7 total hours with no disconnects.
I still plugged my phone in to the 12v charger occasionally to keep its battery from draining.
I much prefer Google Maps and Waze over Kia's stock navigation system so this is a huge plus for me as well. Much thanks to all the recommendations here.