Gotta agree with what everyone else about the quality of the saddle you posted.
I've seen "Barefoot Treeless Saddle" used for around $400. I've got a couple friends with those, and they seem to last a long time.
One thing I've noticed about treeless saddles is they tend to slide when you get on your horse. If you have difficulty mounting your horse from the ground, its probably not the best type of saddle for you on the trail.