The only down fall we can find is that this device does not support telenav. It supports LBS (BlackBerry Maps) and of course google maps or anything else of that nature. Hopefully BB app store will offer a download for this feature. Other than that its pretty flawless. our customers and sales reps all seem to love it.
The ATT BB 8900 does support ATT Navigator, but there is a problem in getting it set up in the system that is no fault of the phone. There was a change in the system that moved Navigator in ATT's set up screen to a different area and that area only opens up premium downloads, such as Navigator based on the IMEI on the phone. Certain IMEI ranges were left out, not just for the 8900 but for the Nokia E71x, the LG Xenon and Motorola Tundra. If you were not able to get Navigator put on your phone, get hold of Customer Care and have a Trouble Ticket made out for your IMEI. It may take a few days for ATT to get it going, but they can.