Thought I'd share this as I was looking at getting a double din for my new (old) car as I really want a reverse cam and Carplay (you know, the most important things to have in a car.)
I've had the a6 before and it was a great little thing. Plenty of cables to install on different iso connectors etc. Only issue was the brightness was a bit too much at night (though easily solved by having the screen turn off after a set amount of seconds).
Note - this is a double din unit, so ensure you can fit it in your car first.
F7 WE model seems to have good feedback being Linux based rather than Android OS.
https://www.ozbargain.com.au/comment/14145880/redir
Wonder if it's back at $159 with the same code on ebay.