Lloyd hit the nail squarely. The ability to adjust different loads to point of aim. How many posts have you read where a new SAA owner complains about his new gun shoots to the left and high or low??? Maybe for quick acquisition, self defence, 10 to 30 feet, fixed might be better or at least as good but for the average shooter, hunter, or target shooting, adjustable sights are better. Remember Colt didn't come out with adjustable sights on the SAA until 1890 (the Colt New Frontier, best looking SAA ever) as a target model. If it had been sooner I'm bettin thats what most would have carried.... I've sold off all my old model Vaqueros and replaced them with adjustable sighted BH and BBH and am actually starting to hit things out to 50 yards rather consistantly. I'm a believer.