I agree with the practice, but I've not had any problems with Sig Romeo and I have 3 of them on different guns. I really like the circle dot, I think it comes to your eye faster when drawing.
I have an AGM ASP Micro. AGM has the same thermo's that Leupold has, so it wouldn't surprise me if they make them for them. I found I had deer around the feeder and was spooking them when I walked in in the early AM. I got tired of seeing the time stamps on cams with deer walking away. It works...