I recently purchased a hang-on seat that was recommended to me by a good friend. He likes the concept and I've used similar seats in the past to ensure a comfortable stay at my chosen spot. I've owned two Summit Trophy Seats and was pleased with both of them. (apparently the people who stole them are too!)The new seat I purchased is called a Millennium hang-on seat. Although it doesn't appear as comfy as a Summit, I'd say overall it at least matches the Summit and my Buddy who owns both says he prefers the Millennium, without a doubt. It is quite a bit lighter than the Summit too.
I do prefer it's ultralight weight and materials that will not hold water (read that get wet) It sets up in about 60 seconds and I can sit for 4-5 hours easily in it. I was sitting in it yesterday when I took my buck. It turned out that I could not get a shot while seated, but was able to simply stand and get a good bead on the deer through the brush. The view being a foot or so higher than if you were on the ground is better too. As far as maybe not being so "hidden" as sitting on the ground, a mature doe passed within 15 yards or less, looked right at me and then walked away, unconcerned.
Just wanted to make note of a pretty decent product that could help you hunt new areas much more comfortably while costing only about $70.