Hi,
I tried HP6515 and iGO maps during my visit to Wien. Overall satisfaction is very good. About maps and devices.
Maps
Maps are really very precise, SW is very fast (I used it in car), streets are updated and it is easy to find location. POI database could be better (updated)
HP6515
Display size is not big enough, battery life is approx. 2h (you should have car charger). You can’t run WM5. Allocate max memory for running maps.