The major good points first. THIS THING IS COMFORTABLE AND WIDE!!! I'm 5' 6" and 250 lbs, 39 years old, and my son is 6 foot tall and 250 lbs and 16 years old. We both use this chair regularly, and we both fit in it just fine with no real complaints. For about $300, I think that it was worth it. The materials are great, and feel very sturdy, and the chair is very adjustable. It's not noisy or squeaky.
The piston is a little springy, so plopping into the chair is nice, and the seat is soft. I got the extra wide option because the "racing" style of these modern seats adds those stupid raised edges on the sides, and I thought they would be annoying if the seat was too narrow, and I was CORRECT! Thankfully, this seat is extra wide, so those edges are less of an annoyance. I say less, because they are still there, and are a little annoying, but still padded enough not to ruin the experience. Had we gotten the narrower version of this chair, it would have been a deal breaker.
The pillows are where my son and I differ. He doesn't like them, but I do. They are soft and convenient, in my opinion, but he doesn't feel that they help with ergonomics at all. They attach and detach pretty easily, so it's no big deal, and the back is still comfortable without them.
The back is also very adjustable, thanks to the reclining feature. With the piston located further towards the back of the seat, the center of gravity allows for almost horizontal positioning, if you want to. It's not very tippy, although I've almost tipped forward, rather than backwards.
The materials for the chair are pretty great. The armrests look like hard plastic, but they are more like a harder rubber-like material. Firm, but not hard. The arms are also very adjustable. They move forward, backward, in and out, up and down.
The seat feels like a dense foam. It's a little firm, but definitely soft enough for long sitting sessions. The leather-like material is soft and supple. The headrest area of the back of the chair is soft and comfortable. But again, the raised sides of the seat are a little annoying.
The only real downside of this chair was the instructions. They only used basic pictures to guide, and the pictures lead you to believe that the arms should be put on earlier than they were supposed to. Not a major issue, but I expected better there. It was still pretty easy to assemble with one person. It took about 20 minutes, but I've put several office chairs together before. It's not rocket science.
I attached pictures to this review. I added a king size Mounds bar and a D&D Essentials kit for scale. Lol. Also, I took a seat-level picture, so you could see the raised side.