I've had the original AW since April but, as a runner, knew I might sell it and upgrade to Series 2 if it included onboard GPS. While I always carry my phone with me (mainly for music), I've had some inconsistencies with pace and distance with my AW 1, and that continued today when I did the Bronx 10 Mile and had Runtastic's measurements off by .3 miles too much and faster by 13 sec/mile. I expected to be a little off, but that seems a little high to me. Have people found the GPS on Series 2 more accurate than the first version? I'm considering switching so I can get more accurate stats during training runs and races. I know Series 2 uses the phone's GPS unless you don't run with a phone, but I'd just put my phone in airplane mode while I'm running. Thoughts?