I posted these questions on another forum before I found out about this one and thought, since this is a DJI Phantom-specific forum, I'd have better luck here. As you may be able to tell, I'm new to drones and electronic gimbals in general. I have been using a P2 v2 with H3-3D bundle with a Hero3 Black so far. I just ordered a Hero4 Black and wanted to know: Is the H4-3D model shown here (http://www.amazon.com/DJI-Zenmuse-H4-3D-Gimbal-Phantom/dp/B00SG9D3IS/) a complete drop-in replacement for the H3-3D? Will I need anything else to get my Hero4 balanced on my existing P2 (like a H4-3D GCU http://www.amazon.com/Zenmuse-H4-3d-Gimbal-Control-Unit/dp/B00U6OHN5U/)? Will the Hero4 and H4-3D sufficiently clear the ground using the stock P2 landing gear? My Hero3 with H3-3D barely clears and the LayerLens actually touches the ground during startup.