To answer the question about the location of the buttons (hazard, camera, autostart/stop), they're relocated to the top of the unit, like in this picture.
You can still run Android Auto (AA) through Sync3 and don't have to pay for anything, but Sync3 is formatted to only use the top 1/2 of the tablet screen. The bottom 1/2 would be used for whatever app you are concurrently running. If you buy one of those AA dongles off Amazon, then it'll run AA full screen (sort of) on the tablet, and also gives you a wired data connection. The "sort of" that I mentioned is because there is a ********* bar at the top and bottom of the AA screen that I'm not sure how to get rid of. It might be something in the settings, or maybe that's just the best we get. See this pic. Red lines show the black bars that I'm trying to describe.
Regardless, if you have a mobile hotspot, the map program that's on the tablet utilizes the entire screen and is very smooth. Sorry if it all sounds confusing, but depending on what you want to do (GPS maps, telephone, music), there are many ways to get it done with the tablet. Overall, I'm very happy with it and will be keeping mine. I had the older PX3 and returned it a few months ago because I couldn't get the backup cam working.