The sight is simple to use if you are lined up and see a dot inside of a circle you are good to go. Only time and use will tell the tale.
The sight works for me because of my eyesight. A regular pistol sight looks blurred to me and I can not align the front sight properly within the rear sight. With reflex optics on my pistol just put the red dot where I want the bullet to go and its done. Why I appreciate the sight on the SAS.