[Q] Android Head Unit -- Confused! topic

Hey guys. I'm looking for a head unit to put into my Volkswagen Rabbit. Out of all the OEM-look Chinese units, I like this one the best because it looks most like OEM. Here's the link: http://audiosources.net/prod_view.as...FId=t3:50017:3

I'm not too sure how these android HU's work. Do custom ROMs, theming, etc still apply or is this a whole different thing? Can you update the firmware like you would with an android phone? Any info you guys can give me would be greatly appreciated!