I have an o.s.la40 and three evolutions, a .40, .46, and .61. There is no comparison between the evos and the o.s. la's. The evo's are much more powerfull, idle better, and are quieter. They also are all metal instead of using composites. They all start with a flip of the chicken stick. All three ran great right out of the box. I think the evo's are going to give the O.S. fx line a good run for the money also. I know a couple of O.S diehards who swear by them. But, they took a double take when they saw the evolution's run!!!