I killed the only tom I shot at with the Jellyhead though, 15 yards and laid him stiff...so it does work.
I don't see why a turkey would not be laid stiff with any choke at that distance? I guess people like to spend money, but I have seen guys collect turkeys year in and year out with very standard all-purpose type shotguns. These new turkey special type guns and specialty choke tubes may look nice, but won't necessarily get you more turkeys!