The iPad gps is pretty patchy ( not unreasonably) but my concern is that ozrunways on the iPad will give an indication of satellite gps reception and display flight data that is completely wrong due to poor gps reception.
No it won't give an incorrect indication and using it inside the window of an A380 is not really a good guide on anything.
Ozrunways is a pretty good VFR aid - especially for local flights n areas where it can use the mobile network for assistance, but it's not in the same level as jeppview for IFR. Nor do I believe it is intended to be.
The other thread talks in detail about which GPS devices work well with the iPad so mobile network should have nothing to do with it.