I only use mine on big open fields or open timber with several crossings. I use the Flambeau Boss Buck. I've never killed a buck over one but then again I've only used it a couple of times. I've had little bucks come running into it but have never had an encounter with a mature buck with the decoy out, so I don't know how a mature buck reacts with it. I took the antlers off of it a couple years ago in late November and 5 does came into it and I smoked one of them. So, it has 1 kill under its belt, just no bucks.
Its just nice to have to switch things up a bit and to do things out of the ordinary. Biggest reasons I don't use one more? They're big, they can be loud if you don't pack it in put together already, and they make you sweat more carrying one in. They're not that heavy, but when you have to carry one of those suckers for 1/2 mile to a mile to your setup, you can get pretty stinky.