An intricate and difficult start-up process with a lot of calibration (over and over again), Same intricate process with both the iPhone 7 and Samsung S7. A little logical user guide, which means that you need to use 'youtube'. This is not a drone for the unskilled.
The carrying bag that came with is way too small / tight. The danger of destroying the drill / control unit when taking it in / out of the bag is essential (especially the protruding rotor shafts / control buttons are exposed). But Japan Photo should boast for extremely fast delivery via Posten.