Funny, I was just looking on ebay to see how much they are and came back onto forum, saw your post!
I have got one, had it about six months, love it but only really used it for showjumping and dressage. Daughter has done xc in it but in bed so can't ask her how it compares. It sits a little low on my warmblood/tb but he hasn't got a great front end and has always been croup high. Doesn't move about though.
What else can I say that's useful? Previously had a Nelson Pessoa close contact and prefer the jeffries. Very comfy, holds me in a good position over a big fence (I nearly had lift off in my old one). You would be welcome to try if we were nearer!