Haven't heard a thing, but ad copy like this makes me think they may have some ruff edges....

Mast of the WingFox is light and unsinkable, made of carbon prepreg. The rotator fastening mast works with the sail to create one surface. The surface of the mast itself is about 1 m2, so the measuring-formula embraces the measurement of the sail together with the mast. The weight of the 9m mast is only 9 kg, so the centre of gravity of the boat is very low. This assures very large stability. If the WingFoX is capsized it is so easy to put it upright again. These values till encourage to the effective swimming on the border of the tipping-lorry. In our gallery you will find this examples. The suitable constructional elasticity of the mast lets on the formation of his longitudinal deflection so that if necessary deepen the profile of the sail. Regulated the angle of attack of the mast causes significant changes in flow of the air round the sail. By means of changes of the angle of attack one can efficiently change the power leaning, the speed and the course depending on temporary wind conditions.