You usually get what you pay for - at best. I recently bought a saddle off of Ebay...big mistake. Seller didn't have the measurements right. I'm short and fat - need a BIG seat to distribute my weight. Thought a 20" saddle seat would do the trick.
Seat was nice and comfy, but the saddle popped way up in the back - gullet was too wide, I think. If I had tried to ride Dancer in that saddle, I'd have cut her in half with the girth! Not only that, but the fenders were way too long, there was no way to shorten them enough for my short little legs. There went $400 down the drain!