The iphone 6 with all updates is solid and works great.... the Google Pixel is NOT compatible. I tried it with the Pixel and it did take off and went crazy... called Yuneec and they confirmed it is not compatible with the pixel, but they are working in it.
love love the controller compared to working with the phone joysticks.... soooo much MORE CONTROL. Yes there are buttons with no function.... I went over them with a gray sharpie
Be careful when taking the drone from a warm house to cold air... less than 20F. The sensor glass fogs up and it loses sight of the ground. Will fly erratically and not respond properly to controls, even with active GPS
major causes of indoor crashes....
1. Flying over counters, couches, chairs will throw off the ground distance sensor.
2. Flying with GPS "on" indoors
3. Lots of wifi signals in the area, condos especially
4. Poor piloting