Here's a list of what I would want.
It must carry well and pack light. No more than 18 pounds would be great.
Connect to the tree with as little noise as possible. No metal clips banging, no cables making noise when there inserted. One thing I don't like about the summits and wish the would put some kind of hush tubes inside their rails.
A seat that gets out of the way when you climb or better yet the seat is the thing you sit on to climb. No rails.
Grips the tree but doesn't dig into it so hard each pull is like pulling a nail, summits again. I ground the teeth down on mine.
Adjusts to the tree without pulling a pin.
Halfway decent camo ALL OF IT, straps included.
Fits a wide range of trees up to 26" would be good.
Reinforced in the right places.
Comfort, I don't care. Just give me a place to rest every now and then.
Belts instead of cables. I don't like having the shink tubing. It doesn't last which causes the cables to make noies and I've uncovered things that were covered before to find the structure underneath rotten. I get the feeling the cable is rusting under that plactic. Metal has to breath to dry out or it will rot.