I have a x-sight 5 lrf 3-15 model mounted to my night pesting rig. Overall it has worked well for this application and ballistic calculations have been spot on for me. It does have some quirks though. The user interface is slow to navigate, and its missing quite a few settings that would greatly improve its overall function. For instance, after turning off the optic, the ballistic calculator defaults to its disabled state upon powering up the device. The user must remember to re-enable the ballistic calculator in order for it to function, and this task probably takes a good 10-15 seconds to accomplish. I don’t understand how the designers failed to create a startup function in which the user can quickly enable the ballistic calculations and pick the profile they wish to load, or just have the optic default to a user specified profile upon startup. Another example is the time it takes to grab a lrf reading and update the point of aim. After pressing the range button the lrf begins taking readings that last for at least 5-7 seconds, during which time the reticle is replaced with an lrf aiming rectangle. Pressing the range button again, does not stop the process, it must be allowed to finish. The lrf seems to display the measured range quickly (2 seconds) and then just keeps ranging needlessly for an extended amount of time. It would be nice if ATN included a user setting that would allow the user to select the desired duration of the ranging process. What is your buddy planning on using this optic for?