I agree, if he has an Ultrasonic equivalent (whatever that is??) and a 10.0 m2 rig
then the Windsup is all choice.
I used to sail a Starboard Serenity, and that was the same sort of choice.
I'll admit I'm biased......I don't SUP.... uses too much energy for very little gain when
in most cases I can put a sail on the same board and go as fast if not faster, perhaps not
in the same direction tho.