Tried the XL yesterday and for my weight it has enormous amount of lift.
I foiled in up to 7 to 8 knot max. breeze using a 10.4m Cloud strutless kite and the XL was effortless.
I can foil on the medium in this level of breeze and it would still be my preferred wing.
The XL just felt too big however I foil with bigtony and he is 30kg heavier and it works for him.
My XL is for SUP foil and windfoiling.