Was about 2 weeks in the states too, using N9 Navigation constantly without any lags and stuttering or any GPS connection problems. I wouldn't even want to compare iPhone maps service with the one of N9 because I couldn't even use the iOS one in a foreign country (i was for 3 years with iPhones before I switched to N9). Oh yeah forgot to say there isn't even a good navigation software for iOS (next to the expensive TomTom and Garmin stuff). To all those people here who have those "terrible" lags - idk what y'all did with your phones, but I recommend to use Nokia Care or fully reset your phones. Maybe you are still on PR 1.0 which, to be honest, had some laggy moments But every new OS needs some time (and Nokia even more)...