It does look a good setup, a couple of things I'd need answering first would be...
Can you listen to the stereo (radio, cd or media input) and have the satnav running as well?
Is it compatible with the standard rear view camera/dynaudio/etc?
Also, given as it's the same price as the standard Nav setup, it has limited it's market somewhat to people who made a mistake not speccing it as OEM (like me)