I've been in the Pyeongtaek area for a little over a month now. I shipped my M3 from Savannah, and so far, driving around has been amazing. As the majority of you guys know, the US-Spec navigation doesn't work here. I started using Waze as an alternative since it helped to navigate on-post, but I mainly use Kakao Map on my phone. It works great here. I just had to input locations to the superchargers and few destination chargers into the favorites for future reference. I tried mirroring Kakao Map and Waze through WebKey on the M3 browser. Unfortunately, for me, it wasn't reliable as it disconnects often. So I only use Kakao on my phone.
I have used the superchargers in Cheonan, Dangjin, Seongnam, and Suwon locations. All have been free except Suwon. I'm not sure if it was because of where it is located (Lotte Mall). The few destination chargers I have visited had also been free.
The one issue I have is that I did not get the blue license plates when I registered the car since they don't fit the US-SPec bracket. I visited and spoke with Seoul's service centers about getting the long plate bracket, but they would not sell it to me for unknown reasons. I'll appreciate it if any of you has an idea on to get ahold of these brackets.