I haven't tried my Hidden Hunter blind for deer hunting, mostly because of all the claims that it would have to be brushed in completely, which makes using it kind of pointless.
I do use it for turkey hunting though, and now I'm not so sure about how observant deer really are. I often set my HH right out in the open corn or soybean field with my decoy about 10 yards away, but closer to the timber. On too many occasions for it to have been coincidence, I've had deer come in and sniff my decoys. I don't mean some dopey fawns either, but mature does. I've had bucks come and chase turkeys away before they could get to me. Apparently deer don't care all that much for turkeys.
Last spring I was dozing a bit in the blind (one of the problems with blinds). Suddenly I heard a deer snort and stomp. I looked out toward my decoy and three does were snorting and stomping at my tom decoy. They kept at it for several minutes. Since they couldn't get the tom to run away, they finally got tired of that game and wandered off into the woods. All three were inside 15 yards of my blind, which was sitting in an unworked soybean field.
I keep thinking I need to take a turkey decoy deer hunting with me, but I never seem to remember it. I may give it a try when I go out this week. At least it would give them something to look at other than me.