GPS looks great, looking forward to being phone free sometimes but getting accurate tracking results.
I'm also looking forward to the responsiveness of the phone. When I use Runtastic on my watch and tell it to start a bike ride, it sometimes takes so long to start the screen turns off. I have to wake it up, and then all of a sudden the thing starts, and then it back counts all of my seconds I've been sitting there waiting to confirm it works. Or I go to hit the finish button and it doesn't do it because it hasn't caught up to counting my time yet when the screen was off. You have to wake up the watch, let the timer race up to the current time, then finish it. Makes me crazy when I want to beat a previous time!
I'm excited for speed, responsiveness, waterproofness, and the GPS!