Just came back from a trip from Greece to Romania.
I used my shield as a GPS device and it worked flawlessly.
I put it on the board of the car and had no problem with it.
Stays put because it is fairly heavy and has the rubber bottom.
I used Sygic (free 7 days trial) without any problems on finding the satellites.
The battery holds for about 5 hours but I plugged it in a lighter charger.
Recalculating routes is fast as well.
You can use it with confidence. Personally I think it was the best GPS I ever head