I used to ride in a Big Horn synthetic saddle and now I own a 1969 Big Horn. I actually bought my Big Horn because I loved the one I was riding in so much. I love them. I've ridden in tons of saddles that aren't Big Horn and I have to say that both of the Big Horns I've ridden in have been the most comfortable with the exception of a few saddles I've ridden in once or twice but am sure were worth a pretty penny.
Over all I've been impressed with them. I think I preferred the synthetic over my leather saddle, but my leather saddle still needs to be truly broken in which probably makes it less comfortable. Equitation-wise, I think the leather saddle puts me in a better place (should/hip/foot all lined up) but the synthetic wasn't bad at all.
In any case, they are well worth the money and I love them!
Fabio - 13 year old Arabian/Lipizzaner gelding
Hazel - 14 year old Angora goat
Atticus - 4 year old LaMancha/Alpine cross goat
Rest peacefully, Lacey.