Not sure how good the NEED for SEAT chairs are, but Herman Miller chairs are very good as long as you get a size that fits you. Ergonomics wise, Herman Miller definitely makes one of the best chairs. NEED for SEAT seems more like a racing chair on wheels, and you are just adding an extra $150 for wheels. If I was to guess which one is better, I would say Herman Miller. Racing seats may be fine for a few hours but for sitting for really long periods of time you probably would want the best you can get.