I have heard nothing but GOOD things about the TruGlo red dot optics (shown back at the beginning of this thread) . I have a couple of students who have bought them and like them. For under $100, it is hard to pass up giving them a chance.
I'm building a new AR right now and have a fair amount o rifle work scheduled this year on the training ranges and I plan to experiment with the TruGlo.
-RJP