I received my PacSeat a couple days ago and finally got a chance to open the box today.
Everyone said it was a really comfortable seat, but until I sat in one today I didn't know WHY. The answer is BACK SUPPORT. The way the seat is attached, your lower back is supported at all times. And the rest of your back is supported by the back support on the main frame.
In a treestand, your back is against the tree and you have to keep your back straight. Its like sitting in a straight back chair, which I can't do for long.
The back of the Pacseat is at an angle, so its more like sitting in a recliner.
Now I understand why folks say they can sit still in one for a long time and not have to move. Very impressed!