Accurate, easy to program and operate and 2 pieces of equipment in one. The ballistics app is simple but extrememly accurate and quick and easy to learn. The glass stands up to the Zeiss repuitation. Crystal clear and great in any kind of light conditions. It has been so nice to not have to carry around a rangefinder with me! They have performed great for everything from competetive long range shooting to shed hunting to guiding clients to their big game trophy dream animal. Gamechangers!