My experience is different than Sean, but he has a heck of a track record so take my comments for what they are worth.
I used to have excellent luck with a flock of Flambeau decoys and killed turkeys regularly. I don't know what changed, but my turkey hunting success took a bad turn for the worse and I couldn't seem to get a turkey close no matter what I did. I still saw birds regularly, but just couldn't get them close. Same property, same blind set ups, same calling (very little for the most part).
Two years ago I took the plunge and bought a pair of DSD's and an AvianX hen. I've bow killed 6 birds the past two years using the new dekes. Again, same private property, same set ups, same calls. Vastly different results. The only thing I've changed the past two years are the decoys. Granted, two seasons doesn't make me an expert, nor prove much of anything, but I know I won't be switching back!
One morning hunting later in the season last spring I had a group of 5 toms waltz right in. I promptly shot one and spent the next hour watching as the other four continuously assaulted my DSD jake and submissive hen decoys. They pretty much left the AvianX alone, but she is an upright hen and while she looks good she doesn't trigger the same responses. This is my all time favorite turkey hunting picture.