12 knots have been demonstrated on the Paris Air Show. But cross wind is a show stopper. Well, not too bad. Pitch response is sensitive, rudder authority is OK, and roll control is kind of slow, specially during take off. In flight it is fully stable and does not need input when correctly trimmed and if there is no turbulence.
Throttle response is fast but power is never enough.
There is no gramm of material wasted, it is just stiff enough to support the fuselage and stay in an efficient shape. As a cantilever wing with such a high aspect ratio the structural design driver is stiffness rather than strength. That's why the load safety margin is ample. With no wind ca. The nose wheel can be rotated off quite soon so that the take off run is on the main wheel only.