Coming from time on a pixhawk and a laptop and watching Tap fly in use I would question this as an alternative. The question I am guessing is that it uses a heavy amount of GPS for the straight line shot instead of the camera, and in doors the gps might be pretty heavily degraded. Still I would like someone to comment on in door GPS and tap fly. Too me an indoor shot with perfect alignment, geometry, and smoothness would be huge.
-Cody