I got mine as a free upgrade, did not bother fitting mounts etc as I have a tomtom rider fitted.
When the rider failed I used the nokia and I was very very surprised as to how good it is.
There are 4 screens - one with all the info at the bottom, one with speed, time etc... one which is just mapping then the one I settled for, a big frickin arrow pointing in the direction you need to go and distance.
Put phone in tank bag map pocket which was a little tricky to see but as a back up it worked a treat.
Think with a waterproof - possibly aquabox - type mount it might be a good solution for GPS on the bike -
Due to the screen size it would have to be in a prominent place!
Only thing is power consumption, all the sites I read before getting it banged on about how much power gps takes. To date I've not noticed it too much. I use it for music on the bike too via autocom and bluetooth, which works well. Also the other thing was accidently pressing the gps button - I've only done this a couple of times - its not that obstructive, its just below the middle cursor buttons
Its a good little phone, good camera, gps is great (I work in london and don't know it very well)
Holds a decent charge - for a light user - I'm not on the phone all day!
GB map is free and all the Europe / world mapping is ££ -not sure of exact costs. Its not the normal nokia mapping, its route 66 software.
Takes a little while to locate - first time took about 25 mins - thought I'd been sold a duffer!! then your looking at upto 5 mins depending on area and how far away you are from the last time it was working - not a problem if your not in a hurry - its no where as near as fast as a standard gps but (I think for a fee) you can use the phone network to get the location quicker.
Normally by the time I'm packed, kitted up and ready to go the gps is located
If your due an upgrade I'd give it a whirl, after a days tinkering I'd figured it all out.
Hope this help!
Sid