I've just picked up the new BB Bold, with GPS etc.. I've used one for years for mail etc, so won't comment on that except to say I still believe it to be far and away the best push email system out there..

haven't tested the GPS fully with the bike yet, but have used it in the car. My observations so far:

- I actually got 2 sets of mapping software, Blackberry's own and Vodafone sat Nav (generic for any VF handset with a GPS). I've only used the VF version so far..

- being a phone, you get instant traffic updates all the time, and they seemed pretty accurate..

- the screen is obviously smaller than a dedicated unit but maps are still clear and easy to read/scroll although speed of scrolling etc is slower than dedicated GPS units.

- voice directions are clear and timely.. no last minute "turn left NOW!.."

- the routes are actually calculated by the VF server, not the handheld, so it takes a few moments to request and download the route data after you've programmed destination etc... this then is repeated every time you go off route, or set a new destination etc..so slows the operation up.

- GPS accuracy seems ok, but I've yet to test it against a Garmin or similar..

- using the GPS seemed to drain the battery pretty quick!

In all, I think the GPS is a nice extra feature to have if you want the device anyway for email etc.

As I doubt there are any secure mounting systems (and it's not weather/drop proof), so it won't work very well as a unit for use on the bike, but I will try it out this week connected to my Autocom and see if 'voice only' direction are any good..

To answer your question, as a tool just for locating yourself on a map when out and about, I think it would be fine.. but as I say, unless you want one anyway (or can get one on a free upgrade ) I'd suggest you might as well just buy a cheap dedicated GPS!

hope this helps!