I have an older one, actually has 4 light sources, battery, tritium, fiber optic and an optional place to put a small cyalume light stick, tritium is dead on mine. I love the chevron reticle and it is fast and light.
Downside, if I am standing in the shade battery set on highest setting and I am shooting at a white plate, the reticle washes out completely, fine on targets with different colors, brown, black, green etc..., talked to Trijicon and they said send it back, but could not get a straight answer if this a weakness of this unit. Let you know after I get it back.