I have a nikon 550 and it's good out to 550 yards. It's an older model and has served it's purpose well. When I bought it, I figured 550 yards was more than I'd ever shoot so why pay for more distance. Hind sight being what it is, I wish I bought one that goes to 1500 or more. We often see elk in the distance and know they are beyond our reach, but the question of how far beyond are reach is very important. Do I need to sneak up another 50 yards or another 500 yards? The terrain in the Rockies really distorts my perception of distance. What looks like it might be 1000 yards away on the opposite face of a mountain, might only be half that, or vice versa. The lighting, a river flowing in the valley below, not sure why the distance estimation is so hard, but it is.