What I find interesting is that they are basically slamming the helicopter into the ground at a speed of 1 m/s to generate an unambiguously detectable acceleration as confirmation of landing. That they are relying on an inertial measuring unit (IMU) instead of laser ranging as a precaution against dust interfering with the latter sounds also clever - and even more that they then again only rely on this IMU for a split second, as precaution against errors accumulating during dead reckoning. De-risking is everything if nobody can walk over and put the thing on its landing legs again.
The helicopter consuming more than 200W of power while hovering surprised me as this is a lot more than I had expected. Can anyone compare that to the power consumption of a hovering drone here on Earth?