My wife just switched off from a Verizon phone and the "Verizon Navigator" software on the KRZR and this are made by the same group (NIM) and are -extremely- similar. The Verizon one was pretty good, although its "recalulating route" can get irritating when the GPS is a bit off and it thinks you're not on a road.

I'm testing the BB version and it seems to be practically the same app, which I think is a good thing as I liked the Verizon one.