I've been trying to use them...not impressed. Like HGxyz said, okay in really bright light, but nothing else. They are definately not accurate enough for me allowing about 4 degrees of rotation in which they "look" aligned, but really are not. I'd almost rather have no sights.
Good Shooting, MarkCO
.40 S&W Club #1, 1911 Club #1067
NRA Life Member and Certified Instructor