I have a 15m soul, and a friend bought the 15m A15, I am around 200lbs.
In general the A15 has a lot of pull, and in stock configuration almost no depower (you really need to add extensions to the side lines).
The wind range that I would use it is
10kn+ with a door style
14kn+ with a normal TT
upper range no more than 21-22kn, unless you are really comfortable being overpowered.
A different friend bought the 18m A15, and while I didn't use it too much he weights around 250lbs and he loves it in the same conditions when I use the 15.