Inge,
I have the new Trekker Master II which is a dressage that allows jumping up to about 0.8m - they don't recommend jumping higher in this saddle.
It has knee-rolls that detach, so you only put them on to jump.
I find it an extremely comfortable saddle, and they have got the stirrup alignment almost perfect for me - I have relatively long leg-bones, and usually ALWAYS feel that my damn knees are "riding up" when I sit down in a saddle. It is not happening in this saddle. I can really feel Freckles coming "through" which I can't really feel in the rigid Wintec. Also, the first time I rode him in it, he started offering lateral movement, which he has never done before! So it's a very cool saddle, in my opinion!
The minor problems I'm having are related to Freckle's age and level of development more than to the saddle itself. I could lunge him "in contact" daily for 4 weeks and solve the issues that way, but I don't want to go there! He does NOT like lunging, and I would have to use a chambon or side reins or something to maintain frame because he is only just starting to come down -
with almost no "hands" and in a bitless, so if I can't sort this out, I just have to wait for him to grow!