Lee-

No I never have, but I have been told that when you get used to them they are about as good as a bench rest. In trees,

In tree stands, I also use a rope brace swing. I tie a thin rope to a limb off on my left side, then cross that in front of you with a gentle bend in it. And loop it, running it in front of you to the right, high on the next branch but leave some hang so you can step in it and take out the slack. So when you want to raise the rest, you step down with your foot and when you want to aim low, you relax. That really works well also.