I picked one of these up just before the season. I haven't had the chance to use it a whole lot yet. I haven't brought anything in with blind calling but that could just be because of where I'm hunting. I'm hunting along a travel corridor so there aren't a lot of deer present all the time to hear the blind calling.
However, a few weeks ago I spotted a 10 pointer about 200 yards away. He started heading my direction but then at 150 yards turned 90 degrees and started heading away. I threw out a few bleats and it made him curious enough to start trotting my way. He came to within 60 yards but I guess since he didn't see anything he turned back around. I tossed out a few more bleats as he was leaving but he didn't seem to care. It probably would have worked better if I had combined it with a scent drag or something else that would have given him confirmation that a doe was in the area. But it was still an exciting experience.