I purchased this rangefinder to pair with my X-Sight 4K pro. It worked perfectly and was easy to set up. I sighted my .223 rifle in at 25 yards with the one-shot option in the x-sight scope menu. After one shot, I was MOA at 100 yards, 75 yards, and 50 yards with the rangefinder adjusting point of impact with the press of a button. Truly amazing.Pros:Quick, easy setupExcellent Build QualityWorks exactly as describedVery AccurateCons:Button placement- to activate the rangefinder there is a small button which is on the rangefinder at the front of the scope. If you need to make a quick adjustment in a high stakes shot, reaching for the front of the scope is a pretty big motion to manage. I purchased the ATN X-TRAC tactical remote which can be placed anywhere on the rifle via Velcro straps and controls both the rangefinder and the xsight menu controls. The trio combine for a powerful setup that you won't even find in high-end night vision or thermal scopes.Size- when added to the already large X-Sight scope makes for a very large optic setup.That being said, I am mainly hunting predators from a fixed position. I am not sure the xsight plus rangefinder combo would be very comfortable to carry or shoot out of a cramped deer stand. I can be done, though.