Got round to fitting my 10.25" Android into the bus yesterday.
Got it from here: https://avinusa.com/10-25-bmw-x5-x6-ser ... ystem.html
Was reasonably straightforward. Plenty of YouTube help available.
My E70 had no USB or Bluetooth audio, so this kills 2 birds

The screen looks amazing!
It can operate in "pass through" So you can use your built-in CCC or CIC system whenever you want.

Hmm tinypic won't let me upload this pic!
http://imgur.com/a/tsXZb
All good, apart from the supplied GPS antenna is blocked by my Comfort windscreen

Cheers