In my D3 I had the VMS500, with a reversing camera mounted. Worked very well. Mounted the unit in the gap in the dash. It didn't fill the whole of the gap but still looked pretty neat.
Liked the VMS unit, and even though I have the Sat-nav in the D4, I will be taking the VMS away on any trips outside of the city. However, the D4 unit does bring up the street nav a lot quicker than the VMS, and is just as useful for my needs as the VMS in this mode.
Cheers,

