Yep, very fair review, apart from the fact that the 2GB download is ALL the map data for North America i think. It is the same data set for both Ovi Maps 3 (which is what you have on S60) and the Maemo version.
The upside of having the map data on the device is that if you are somewhere with no data connection you can still use the maps (which you can't do with Google Maps!)

Look at the Maemo version and look at the online version and you will see they have a very similar UI, which is different from Ovi Maps 3.x UI.

Oh, and good tip is to use a crdit card of similar to take the back cover off (top tip from Maemo summit).