The chair is perfect for someone my size (6' 240). I knew it was a mesh chair so all of what comes with that is fine with me. It does force you to sit correctly in the chair with the mesh you can really tell if you are sitting straight in the chair or turned left or right. For me the back tension is great and the lumbar is right where i need it. When you recline the lumbar moves up your back instead of moving down to the small of your back but this isn't a thousand dollar chair so i wouldn't expect it. I like the nice long warranty and I hope i get the full 7 years out of this chair.
I replace my old chair with this one and I feel it was a great upgrade. The headrest lumber support and adjustable hand rest are great for ergonomic posture. A great buy!
I love the adjustment it leaves about 1.5 inches you can push out or in the side arms and the back chair to make it bigger and smaller. I also remember reading the review that someone's wife was upset because she - in the Dexley - at 5'4 couldn't 'cross her legs'. I am 6'1 280lb male who is very flexible and can cross my legs myself. So i'm sorry your wife isn't nimble - tell her to do some stretches. I for one LOVE this chair and it is VERY comfortable for my size. Even my 330lb friend sits in it and likes it though no - he cannot cross his legs.