I finally got it installed, the full European map (1.9 GB). With v9 it installed a program on the PC, it was useful to manage voices and maps. For example, I could install all European countries or just one, or two, or whatever I wanted.

With v10 they have dumped that PC app, now you unpack the program on the N900's internal storage, with all maps. I guess you can remove the maps you don't want manually from the N900 but I have plenty of space so I haven't touched it.

On the phone, interface looks a bit more refined but it feels slow and sluggish. I haven't tried it on the car (it was too late last night when I got it installed). I saw a couple of good things (now screen rotates using the accelerometer, and it runs in full screen), however I couldn't find the GPS status screen.

I will play with it today after work.