There is no collision detection so you do have to be a bit mindful of obstacles in the flight path. Unlike the Soloshot the tracking device does not require a line of sight so it can be fine in a pocket. If the tracking device does lose connection Lily will stay in place until it reacquires the signal or using feature detection to locate its operator visually. While not possible yet future plans for the software include multiple drones working in concert and tracking multiple subjects.Lily is currently available for preorder at www.lily.camera for $499, retailing at $999. The current goal for shipping orders is February 2016.