Been using this for a few days. I will follow up after a few months.Some quick points:- This is not a big and tall chair even if it can hold 400lbs.- Some people complained there was no instructions. There was in the box I received. It was in the same box as the washers and bolts.- I am 6'3" and 250 lbs so I wanted the 400lb capacity, but the big and tall chairs I have tried were too big- especially the seat.- My main chair in my home office is the Steelcase Gesture- I got a great deal on prime day. I did not want to spend as much money on this chair as it will be used in an office at a summer cottage.Pros:1. Comes in a managable box2. I did get instructions with mine. Plus videos available online.3. I found the shaped seat very comfortable with good padding. The shape makes it seem like you are sitting in vs on the chair.4. The back is low, but the shape gives me excellent lower back support even without a lumbar support.5. Its mostly plastic, but it seems like is some kind of fiber or glass filled plastic. Feels strong.6. The connection between the back and seat is very rigid. Thick plastic and metal. the metal is boxed to make it even more rigid. Previous chairs I had used really thick bar stock which doesn't keep the back vertical over time.7. Assembled chair is pretty compact. Good for tighter spaces.Cons:1. Casters are cheap. I might upgrade.2. Getting the back attached to the seat was a pain especially as you put the armrests on before you attach the backrest.3. The buttons to adjust the arms are a bit suspect.