hmm... I must be missing something here.
I picked up a Sightmark red dot scope after reading good reviews around the web, my FIRST red dot sight.
http://www.amazon.com/gp/product/B00...ls_o01_s01_i03
Build quality seems good enough, good field of view, mostly visible red dot (bright sunlight and snow like I have here gave it a bit of trouble, but you can still make out the dot, which is all one can expect for under $100.
But here's the problem - correct me if I'm wrong, and I may well be, the theory of a red dot is that, similar to a reflex sight, the dot moves around in the window relative to your head position, so it doesn't matter what angle you look through it, the dot is on target, right?
So I set it down on the table, aimed it at the wall 10ft away, and peered through. Eureka, a dot! and I moved my head to the side, Eureka, the dot moved with my head! But wait... the point of aim also moved with my head! Significantly! At only 10ft away, moving my head to the side could adjust the point of aim by approx. 4 inches in either direction!
This effect is generally minimized with a scope which has minimal eye relief, you can't actually see through it unless you're lined up pretty close to center. But with a wide red dot tube like that one, if the point of aim shifts, then how are you supposed to line your head up precisely down the middle to get an accurate shot if it has such a wide viewing angle?