The Ovi maps sound attractive because of the presence of updated POI (points of interests) and that Nokia seems to be pretty active in the region. Furthermore, no internet connection is required which saves you precious quota.
Frankly, the fact that its Nokia-only is a big deal breaker for me. Anyone who uses an android-powered phone or an iPhone (for at least a few weeks) will unlikely ever touch a Nokia phone again.
I'd like to know whether it can be used to locate your current position... If that's possible, I might give it a shot.
An iPhone will start by using the nearest cell tower (not accurate) or Wifi AP to detect your location, once your location is triangulated by the GPS satellites, it will give you a more accurate position (to one or two meters)