I just tried it yesterday and everything seemed fine. I didn't try the waypoints but the bigger screen was kinda nice in general. I also found some other app on the app store that's suppose to decrease wifi extender noise and increase range. It actually seemed to help a little when I flew around areas with lots of trees.
Thanks for the information. I have a shoot coming up this weekend and I'm hoping to have my iPhone 6+ in the next day or so. Does the DJI app take up the entire screen on the 6+. Is the screen brighter than the 5S or 4S? Thanks for the WiFi extender application. I may give it a try.