I am using Maps 3 on E71. It would run circles around Google maps, if it were a finished product. It is not. It is a buggy beta released way too early. Ovi maps has a sound, very good and useful core application, but the buggy 'features' layered on top of it ruin the experience.
I still use Ovi Maps because of the pre-loaded maps, the walk navigation (which works very well where I am at, It knows about some grassy paths in my neighborhood. Not bike roads, though, even if they are shared by bikes and pedestrians.)
My biggest problems with ovi maps: It is intrusive - If I, as often happens, wander to walking routes Ovi maps does not know about, it starts loudly repeating 'Route recalculation.... Route recalculation... in 30 second intervals until I get back to recognized route.
If I set my destination already while on the tube, the damn things will startle the entire car by shouting :'NO GPS SIGNAL!' just as it may yell at any time :'GPS SIGNAL LOST!' Loudly!
Now, I can always tune down the volume, right? NO! (this happened after last firmware update.) If I am to scroll up to check on my route, I will have to use the Center button UP. However, if the volume is down, the center button up will increase the volume. So I can only scroll the map to the walking direction if I have the volume on the loudest!
(this kind of intrusiveness that spoil otherwise good applications is my biggest problem with the E71: The flash on the camera goes off and spoils my photos (try taking a photo of a book page without first turning off the flash), The Ovi Maps is waking up the neighborhood, and the damn thing is constantly ringing because, idiotically, the calendar alarm is on by default. The worst thing a business handset can be is intrusive and noisy)
back to maps: My other problem is the way I need to transfer the activation every time I swap SIM card. That is usually at the airport in a foreign country, when you swap to local SIM. When you need the maps the most! On my recent trips abroad, I was able to activate maps at Helsinki airport using Saunalahti pre-paid SIM, Whereas in Stockholm I was unable to do it with a newly purchased Swedish Tele2 Prepaid and was unable to use maps until I found WLAN access.