The 1st generation ELCAN's as previously said leave a lot to be desired. Climb on the Herc, rifle zeroed, climb off the Herc, zeroing is your guess. It didn't travel well. At first and last light it has good light gathering capabilities. I always found that when on "jungle lane" ranges my time was a lot longer with the ELCAN, than with iron sights, but then I'm just an old fart with preferences.
Personally with my background shooting service condition matches years ago, I'd rather use iron sights. That said my personal AR has a Bushnell Red Dot on it because now I only use it for 3 gun matches where the furthest target is 100 meters away.