Agree, it worked for me. Although I would say that if you are still on 4.x ios then wait with updating until you also update to ios 5.x. I updated to 2.1 and there were still quirks such as a couple of crashes and a sudden stop of a recording track for no reason. I updated to ios 5.1 and it works really nice now. I especially like the accuracy threshold which removes a lot of the track jumping around when there is no good gpsfix!