I always connect my phone to the usb slot to use Android auto. Hence it's always on charge anyway. I always thought the option of a wireless charger was a bit redundant. $300 is a lot for the convenience.
and since i have a protective case on my phone...the wireless charging doesn't work that great thru it. (it could also be that i have a door access magnetic key card in my case, as well as a thin metal tab that is part of my magnetic phone mount (CD style). but, i have removed all those items and left just the case on - and the wireless charging is still eratic. i just plug it in the USB slot