I would recommend that you look at the gametamer's, I have two of their older stands and would nottrade them for anything. They are comfortable enough to stay in all day and I have one that is 35' from the ground and I feel safe enough that I have dozed off a couple times. The new ones have a different seat on them that mine but I would be willing to bet they are just as comforable. Mine have the octagon style floor and they are the larger one's, they are expensive I believe in the 250 range, but worth every penny. If you buy one, you won't regret it. Also they adjust so you can put it on a leaning tree which is a nice feature, to say the least. These stands have never made a noise and they have both been in the same tree for over 3 years, last year I had to re-adjust the chain around the tree.
www.gametamers.com
Good luck