RE: Weston TigerShark 150mph+, 150hr build
I believe one of the key changes was the wing airfoil, which on the original was apparently more of a flat plate than a skinny real airfoil.
And it's good to know which one you're buying. As it was explained to me, Weston USA has been selling off a large stock of the old version for a while now, and some people don't realize there is an upgraded version.