This product came to market too early. Great idea but it has some real design flaws. I did not have trouble using it in warm or cold weather. It is very difficult to keep zeroed and sighting in is a huge problem.
Pros: Once zeroed in the unit performs OK. Not as accurate as hand held version
Cons: It is very difficult to set up given the current mounting system. Leopold needs to redesign the system with micro-adjustment ability
This review was written in the old system and had content requirements that are different than reviews written today.