I sat on over a dozen different office chairs before deciding on this one. Not only is it extremely comfortable for long periods of time it only took about 20 minutes to put together. If you're looking for a chair that's under $300 and are going to be sitting for 5+ hours straight a day I would highly recommend getting this chair.
Had it for a month so far and it is very comfortable for extended periods. good back support and adjustable tension for people who like to rock back and forth a bit. Sturdy. Assembly is not quite as easy as they say but can be done by one person but two will definitely help - make sure to only half-tighten ALL the bolts until the entire assembly is done.