I got to try the Blade Fat Lady recently and I really liked it. Since I have gotten to fly both of the fat sisters, Infinity and Fat Lady, I thought I would give you guys an opinion. I was riding the Fat Lady no problem in 8-10mph which was verified by a good wind meter and the lack of any white caps.

The Fat Lady seemed very over sheeted and didn't feel quite as dialed in as the Infinity. The Infinity does feel a bit over-sheeted too for my taste but that is easily compensated with a knot move. I had to pull the depower completely on the Fat Lady to get it to feel comfortable. But I did like that it flew a bit further forward in the window than the infinity. I felt like it may have had a little more low end cuz I rode it in 8-10mph (which usually is the minimum for me on the Infinity) with no problem but maybe the ocean was cooperating and i am getting better at utilizing the Oxygen. The infinity turns faster and does down loops better too. But the Fat Lady is still a fast kite for its size and definitely is not boring to fly. You can definitely tell they are siblings but I was also able to feel a difference. Honestly either one would make me happy as a consumer and I wouldn't notice the minor negatives after the first couple of solo sessions in sea breezes. In either case riding in 8-15mph is definitely possible as long as you match it with the right board.

Likes:
Infinity - A little bit faster turns, better grunt, refined feeling, nice big bag,
Fat Lady - Flys farther forward (upwind), tad better low end, a bit better at boosting,
Dislikes
Infinity - Dull graphics for my taste, sits a bit too deep
Fat Lady - Needs tuning, too small of bag, single flag line is annoying for self landing and not necessary for a light-wind kite