I'm with you Squidzilla :thumb up: Even better at $269 right now for the Win CE version
GPS NAV System 7" Car Stereo DVD Player Bluetooth Touch Map SD EA for BMW E53 X5 | eBay
At nearly 3X the price the GM5150 unit is working well for me in my E46 and I don't need the Android features, although, I must say that hooking it to my phone's hotspot would be a very cool feature to run Spotify or Pandora apps right in the unit.
Mike