I had one, it was the most ucomfortable saddle I have ever had the pleasure to own. In fact, I have no idea how I was conned into buying it. I sold it on as soon as I could. It was like sitting on a stone slab it was that hard.
I adore mine, its SO comfy, but a bit heavy to lift, its one of those, nearly dressage ones, a scandica, i do everything in it except jump, but we do hack in it and jump ditches, i can go for hours in it, it never moves, rubs and is so wonderful!!!
I love them for jumping as they hold you in a fabulous position. They are quite hard and take a bit of getting used to but I wouldn't jump in anything else.
I love mine, had it for years and hunt in it happily.
Have advertised for a black gp/jump one for my mare who is too wide for her kieffer, not having much luck finding one (kieffer can be adjusted but it's showing it's age so plan to sell it)
Love mine - had it made to measure both me and my mare so is really comfy, never moves and still fits my mare perfectly even though its 8 years old, used all the time and my mare has lost over 14 inches of her girth since it was made. Was the best fit for her as a wide cob with hardly any withers to speak of. Regularly hack out for 3 + hours and never have a problem.
My equine chiropractor hates them. She says that she treats too many horses with recurring bad backs who have Stubben saddles for it to be more than a coincidence.