I've only had mine for a few months, but my brother has been using a Corriente almost identical to mine for years under a heavy load of ranch work and feedlot work. He's roped and drug 1500 lb+ cattle countless times over the years. Other than being a little worn and dirty in places you would expect a ranch saddle to be worn and dirty, it still looks like it did when he got it.
I would consider that dang good quality for the price.
I couldn't speak for the KO saddle though.