Update 10/24/2022:The seller reached out to me and offered me a full refund even after 3 years of use. They stated that what matters to them is that a customer is fully satisfied with their product and if not, then they are willing to pay for it. Although the product did not meet my standards of satisfaction, the customer service offered by SIHOO and their willingness to stand behind customer satisfaction is rare. I still stand behind my full review but have bumped up the star rating to accommodate for their surprising level of customer service.Original Review:For a quick summary so you can move on to the next review:The seat cushion bottom's out and you can feel the wood/plastic base. My model came with a foot-rest extension. The foot-rest is too short for me when fully extended and digs in to my ankles. The back rest has some "play" when fully upright and never gives you a truly upright seated position. I've owned it for 3 years and it's just not for me.Details:For some background, I'm a 6'0 tall 180lbs male and I work from home. I also spend a lot of non-working hours on this chair because gaming is my preferred pastime activity. I need a chair that can handle 8+ hours of use.Seat: From the day this chair arrived I've had issues with it. My biggest concern was with the seat cushion. I immediately felt the bottom of the base when I sat on it. My wife, who's considerably lighter than me also mentioned that the seat was too uncomfortable for her. I've just dealt with the uncomfortable seat until enough time went by where it felt like all cushion was completely gone. From that point forward I've used a pillow to add comfort.Backrest: The backrest has some "play" or wiggle room when in locked positions. When fully upright, I want a backrest that stays in place so I can sit back, upright and get to work. This was never the case with this chair. When in the fully upright position, if you lean back into the chair you'll feel the backrest give in slightly putting you in a posture that's slightly off from upright causing you to tuck your chin in a bit to accommodate. This wiggle room is enough to where I keep my lower back resting on the backrest but I can't lean my upper back into the seat. It's annoying but not unusable. When fully leaning back to lounge and watch some videos I find my shoulders coming in contact with the chair frame. This means I'm never fully comfortable when fully leaned back. I do love the mesh material though. The breathability is great and allows my body to naturally cool.Foot-rest Extension: The foot-rest extension (included with my model but possibly discontinued?) is too short for me. In the fully extended position it's constantly digging in to the back of my ankles to the point where I slightly bend my knees and just place my feet on the foot-rest instead. My feet extend over the edge of the foot-rest a good 6 or 7 inches. If you're shorter then maybe you'll be fine.Build Quality and Customer Service: The build quality is decent and lasted a good 3 years before things started to break. The first item that broke was the locking mechanism for the foot-rest. My customer service experience with Sihoo was great. A quick message via Amazon or Email and somebody quickly got back to me and sent a replacement foot-rest at no cost. The second part to break was the metal bracket that holds the backrest tilting mechanism. This would probably mean the entire backrest needs to be replaced. Instead of going through the hassle of dealing with any replacements, I've decided to move on and purchase a new chair.Misc: The remaining parts of the chair are fine. The armrest is comfortable enough to rest your arms but not modular enough to adjust to your liking. The headrest is comfortable enough to use while lounging back into the chair but not usable when in an upright position. I replaced the original caster wheels to work better on my solid floor.Final Thoughts: At close to $300 I got about $100/yr use out of this chair but didn't enjoy the experience very much. The main components that should provide comfort were not fully there. All in all, I stuck with it and made modifications as needed to "get by" but I can't fully recommend this chair for anybody with a similar build or need.