In case anyone is still reading this thread, I've just fitted one of the Vanku Android 10 units in my VRS after a brief experiment with one of the REALLY cheap far East specials (sound was abysmal so binned that straight off).
First impressions are good - sound is probably actually better than the original HU, having Maps etc available for nav is so much better than using a vent phone holder, and being able to take calls from it is super handy.
Lessons learned:
I got lucky that my canbus is a later revision that doesn't drain the battery, but wasn't even aware that was a thing until after I'd fitted it. Would have been smart to check that first really.
You need a whole bunch more stuff than just the head unit - I got a Connects2 canbus quadlock - ISO adapter so wouldn't have to mess about with wiring into ignition switched fuses, and needed a double din cage and fascia adapter and it's still not quite right. Need to do some extra sanding, I think.
Oddly, fitting this actually brought my insurance down a bit when I declared it - no idea why, but there we are.
Hope that helps anyone still looking at this thread!