I first bought the U&S Hyken chair but did not like it for several reasons. I returned it and purchased a Dexley. The Dexley has a wider seat. However the sides of the seat are plastic and swoop up so there is still a bit of discomfort if you are wide or sit with legs splayed. The Dexley also has wider elbow rests. When sitting in the Hyken my elbows naturally fell off the rests because they were too narrow. The Dexley does not have a way to lock the tilt like the Hyke. But this feature seems to be useless so no matter. The bar that extends from under the seat to allow you to raise and lower the seat is easily moved by my heels when my feet are on top of the wheels. This is a position I enjoy but is not a deal breaker. The Hyken head rest is not comfortable while the Dexley is. This is essential when sitting back to watch a movie or when I am only listening during an MS Teams meeting. In short the hyken is a bad chair all around and the Dexley will suffice.
The chair is fair to middlin... It might be ok for someone taller. I'm only 5'5" and I feel a bit like Lilly Tomlin in this thing. I do like how far the back reclines. It's probably the only thing I like about it. One thing I found pretty annoying and it has nothing to do with my size. The arms are plastic and they have an outward slope to them. They force your arms to the outside of them and because they're slippery right off the edge. I find myself almost unconsciously correcting my arms all the time. Probably worth the $100 I paid for it.
The construction and materials exceeded expectation. The headrest support actually works and adjusts as needed especially when reclined. Lumbar support is better than Herman Miller's since there is more range to tune for optimal comfort/location. This chair easily comparable to competitors at 2x to 3x the price. Buy it you won't regret it.