The rotor speed was approximately 5x what would have been needed to lift the same weight here on earth due to the low air pressure/density. They plan on using larger aircraft in the future to move scientific packages around but they will have to have correspondingly fast rotor speeds or larger rotors to compensate for the difference in density.
Still, kudo's to the team, the programing had to be done remotely and in advance. That's a pretty tall order. If you have ever flown a drone in real time you know it doesn't take a whole lot of breeze to throw you off course.
What's the point of an open door policy if inside the open door sits a closed mind?