Don't know if I had a lemon, but I returned this. Hurt my eyes -back-projecting illumination was like staring into a flashlight, wiped out night vision after a few seconds. Couldn't keep it to my eye long enough to fully adjust the focus. Did not perform for me outdoors, which was my intent. Did not have range, could not focus, bright objects flared, image had streaks (like old TV screens).
Cons: see comments
This review was written in the old system and had content requirements that are different than reviews written today.