I dont think anyone would seriously consider those huge H17 style armchairs. However, the sleek sportwings are a great addition to any (somewhat overpowered) singlehanded boat.
As little as I know about construction I do think that sportwings, since they attach directly to the beams, do not put a great strain on the hulls like the H17 wings do.
http://www.thebeachcats.com/albums2/album139/IM000825.jpghttp://www.thebeachcats.com/albums2/album139/IM000827.jpg 
