Used to have a pair of sportwings on my FX-One but took them off after a while because it doesnt really add anything other then another piece of kit you have to drag along to regattas.
Downwind those thing where horribly in the way and made it almost impossible to trap from the transom.
Upwind they would hit waves and the tubes would hurt my feet after a few hours, it also ment you would trap quite high which IMHO is not as pleasant (lower the better).

I think Macca is a bit obsessed with banana-boards today, after he spent all of yesterday playing around on the F20 Carbon ;-)