I used to have one, had the cair changed to flock as hated the cair system. It worked really well on my welsh d mare who was curvy in the back, not on anything with a straighter back, they have the same trees as wintec, or always did, and they are known as banana trees.
It was comfy but if you had any high jinx the very high cantle could be a pain in the rear end, literally. I remember using it on one of the point to pointers who was renowned for broncing, the damn saddle kept hitting me in the back and bum amd unseating me. Not ideal at all imo on anything that likes to throw its back end in the air. Nice supportive deep seat though that you could ride in for hours and the flap shape suited me for jumping but again the high cantle could get in the way and whack you in the behind!