Few weeks ago I downloaded the whole US maps for Ovi Map on my N900. Yesterday I had to use the application for the first time, to find a route around an accident. I love the way Ovi Maps is made, the features that - I think - will make this a great application and are missing:
* automatic rerouting (if you pass your turn)
* the ability to search for an address, or at least for an intersection (seems like the names of the streets are saved on the device)
* the ability to save POIs

Well there's a few predefined ones(just press the button to bring up the status bar and everything, then press 'Places' in the bottom left corner). I saw 4 POI's, I think. So I assume they will add that functionality soon.