I purchased the same model 5-6 years ago and was satisfied with the quality of the chair. Width of the chair for hip and the length for the back are big enough for big and tall person. I am 6’3” 210 lb and no problem with this chair. Only reason I re-purchased this model was because seat height adjuster by air is not working any more. My old seat is going down as flat tire. Hope this new chair will last longer this time.
Basically if you're looking for something ergonomic and posture fitting like a reputable european brand that usually sells their models in the $1k-$5k range this is the perfect alternative. I started a new job that had a nice looking chair but it killed my back after the 2nd day. This chair fixed it all. No back pain after the first day and no back pain after a week.
This chair is great but I am just a little too tall. The headrest would dig into my shoulders so I did not put it on. I am 6'3 for reference. I wish the Dexley chair had tilt lock as it would make it more appealing to me.