i have used the hardware since 2 weeks and the software "sygic" on iphone sicne the last 3 months, during whihc i have travelled through interior punjab and naraan kaghan.
regarding the hardware
-relatively poor and flimsy enclosure and plastics used
-low battery time, but you don't need battery while in car, its almost all the time plugged in
-good dual core processor, runs avi videos perfectly
-good big screen, i.e. 5 inches
-the fm audio transmistter has poor rang and quality.
-slow usb transfer rates, i use sd card for data transfer.
-the hardware can be hacked and garmin mobile xt can be used in it
-very good gps reciever
maps
-awesome maps, much better than the opensource type made by individuals
-very good detail and poi's
-some 3d landmarks, looks cool
-i never found the routing to take time
software
-sygic it self, the software is not as good as garmin, by good i mean user interface is not that good.
-customization is missing, like decustomised cars
-fuel average calculator is missing