I have played with this model briefly in Microsoft Streets and Trips. It seems to me that the biggest performance handicap with this model is the 1gb of memory, but that can easily be upgraded to 2.
Overall, I'm sure that it will make an excellent easy self-contained CarPC. As for mounting it in that tray, I'm trying to get some answers as well in another thread. What kind of vehicle do you drive and how are you intending to mount it?