We have also used them for several years in the U.P. They work real well. But after several days of hunting out of them, in cold weather, you will get condensation on the inside so they will drip every once in a while. Also stay back from the shooting window that you use. If your face gets close to the window you will look like a headlight to the deer. Finally, we use a shooting stick for steady aim a/c the windows don't have anything to rest your rifle on
Long