So far both my Delta points and Fastfire III have been flawless. One of my shooting friends has another brand and has had nothing but problems (he's a talented gunsmith and machinist who has had to keep his running by using his talents.) I'm a fan of Deltapoint and Fastfire III.
Viet Nam 1967-1968
Alpha Company, 1st Engr Bn, 1st Inf Div.
I like things that go BOOM!