Success setting this up on my 2017 e-Golf with two Pixel 4a phones. I had to enable Direct Mode and Passthrough, otherwise it took about 90 seconds for everything to connect and work. Once configured properly, it's really fast - maybe 10 seconds. Consistent too. Great job developers!
One issue I have is related to using multiple phones with the device. The connection range is too good! If my wife gets in the car in our garage, my phone will connect (since I last used it) even though I'm in the house. And it doesn't gracefully drop the connection when she drives away. The screen freezes when the car is too far from the phone, and it won't connect to the phone in the car right away. Sometimes it'll reset after a few minutes and connect to the phone in the car, but I've had it go 20+ minutes before I gave up and manually unplugged/replugged it.
My preference would be for the device to connect to the "closer" device. That is, if it can detect which phone has the stronger signal, use that one. Failing that, I would like to see it reset more quickly after going out of range. It's a real usability problem since we alternate use of the car a lot. Most of the time the device is connecting to a phone pretty far away which won't be coming with it. Not ideal. Thanks!