I don't have one to sell you but I can offer some input. I currently have the Helinox (Chair One I guess), the older version of the REI chair and an Alite Mayfly. I've seen the Treo in stores but it looks bulky and heavy. While I like the Helinox and REI chair, they like to sink in anything but hard ground. There are ways to mitigate this but it involves bring something else with you. I had looked at the Helinox Ground Chair before I found my Mayfly for a steal. What's nice about them is they don't sink and you can rock back in them a little. They are lower to the ground which can be more of a challenge to get in and out of but they will also take up less space if you are using one in a tent. So far, the Mayfly is my favorite by far and it has a taller back section which makes it more comfortable.
Hope this helps in your search a little. While some may scoff at the idea of having a chair, my old bones really appreciate having a comfortable place to sit.
I own an REI flexlite and a Wildhorn Outfitters. Unless you really want to shave the weight, the Wildhorn is much better, comes with special feet for soft ground and is 50 something shipped from Amazon.