We sail the Super Taipan in 30kts with no problems at all. The only small issue is the fact that the kite is pretty big and the hulls lack bouyancy to drive it hard downhill. but we just go a bit deeper and get there almost as quick.
The advantages are very clear in the lighter wind ranges where the power to weight really comes into its own and the boat is super quick particularly downwind.

With a more bouyant (ie longer) hull and slightly less weight i would expect the boat to be quicker in all winds and in particular downwind in a blow.

The light weight is only a problem if you chicken out and start sailing too high upwind, as soon as you do that the boat slows up a lot and then the breeze starts to pick the tramp up and then you are in a world of hurt....

We keep pressing and drive the boat at its proper angles and it gets upwind very well. Some of this is due to having a jib which moves the COE of the sail plan lower than if it was mainsail only like a M20.