I have used treestands for turkeys but I wasnot only hunting turkeys. I was hunting deer with the bow also. Never been successful by using a tree. I don't think I would use a treestand if I was just hunting turkeys. I would want to move if the the turkeys were not in the area so I don't think a treestand would fit my type of hunting.
I do know a couple of hunters that hunt spring turkeys from trees and have been successful. I personally would not or like that method but it has worked for them.