Serta Big and Tall Executive Office Chair with ComfortCoils Technology - Ergonomic Computer Desk Chair with Layered Body Pillows for Back Support - Heavy Duty Swivel Chair for Home Office, Gaming, and Workspace (Black & Gray)

I've only had this Big & Tall chair for sightly over a week, so this is just a first impressions review as I don't feel it's fully broken in yet. I plan on updating it as time goes on.It's the most comfortable office chair I've ever used. Although I admit that I've mostly sat in cheap and ergonomically improper office chairs in the past. I'm 6' tall and 240 lbs. and have long, skinny legs; most of my weight is in my upper body and stomach area. The only things that can be adjusted on the chair are the height and tilt. On the right side is a lever to raise or lower the height of the chair. On the left side is the other lever. It can either lock it in an upright position or unlock it for the tilt. There seems to be only a slight difference between the tightness of the adjustment knob to me. You have to push the chair with your legs to get it to tilt back and you have to hold it with some force on your toes to maintain the tilt. Otherwise it goes right back into the upright position. It gets rather tiring to keep pushing it back the entire time. I wish there was a locking mechanism to keep it in the tilt position that you want and hold it there. It's easier to maintain the tilt with the chair at the lowest height and more difficult the higher up you go.I love the coils. It feels like sitting on a firm bed. Also, for me, the seat feels firmer at the back four inches or so and less firm in the rest if the seat, but I only feel that uneven firmness when I have my butt pushed all the way back in the seat. It's not too uncomfortable, but it's definitely noticeable to me. The firmness feels more even when my butt is just a few inches forward. I'm not sure if it's supposed to be like that, but I hope that firm area will soften from sitting in it over time but if not, it's not the end of the world. The back lumbar support feels just right for me thankfully, because there's no way to adjust it. The back of the seat feels very comfortable and supports my back very well.I love the waterfall design of the seat. It really eliminates having the front edge of the seat digging into the back of my thighs like most other flat or bucket style chairs I've used (no more Sciatica pain!) The arms are also the perfect keyboard height for me and they're also not adjustable. The same goes for the width of the arms. Overall, the chair is just the right size for me. So now I realize that a Big & Tall chair is the way to go for me, I wish I knew about them sooner as I've never seen them being advertised before. I just happened to notice while searching for chairs with coils.I'm a bit underwhelmed by the bonded leather TBH, as it doesn't feel as nice as real leather or even vinyl, but it's not that bad and I'm getting used to it. I would have preferred a cloth option myself. I hope it holds up for the long haul because some reviews state that it wears quickly.The assembly was relatively easy by myself, but I can see that some people might need help as it's pretty heavy and a bit challenging to balance the parts as they get assembled. I used a socket wrench where I could to tighten it, which I found better than the included allen wrench.I've sat in it a lot during the past week and it feels great even after 8 hours or more. I like this chair so much I've ordered a second one to have at work.I just got this and assembled it. I will update the review later, but this is my first impression.1) The chair was maybe a little harder to assemble than my last Exec chair. Having a second person will help. In particular properly fitting/attaching the bottom to the back can be a bit challenging.2) The seating part seems to incline forward to an uncomfortable degree. This weekend I am going to see if there's anything I can do to adjust how the back and bottom are attached to improve this, but when you sit in a chair like this, it shouldn't feel like it's trying to push you forward out of the chair.3) Rocking backward in this chair is VERY DIFFICULT! Like, harder than I have ever found a chair to be. I have tried adjusting the tension control to either extreme and it's just a lot harder than it should be.4) One part arrived broken, namely the plastic shroud that goes underneath. Now truthfully you don't "need" this part at all. It's just a nicety to cover up the way the base joins to the chair to make it look more attractive. In my home office it's not a huge concern. But when you spend a few hundred bucks on something, you expect not to have any part of it defective.The back of the assembly manual gives a website. Well the URL and in fact the domain itself are obsolete. The old domain redirects to the new one, so I got an error page on a totally different DOT COM. Neither of the domains are "Serta", but this company does support for this brand.I tried calling their toll free line and listened to their automated menu. None of the options were for "I need a replacement part" and they made it clear that you would be on hold for a long time and you'd be better off emailing your information to them. So I did.Will update when I see how they handle it.LASTLY my biggest problem with these types of chairs is that the "Bonded Leather" peels and flakes off far sooner than the rest of the chair wears out. It should be weeks and months before I know how this will hold up.UPDATE (2/9/2021): Their support people have not called or emailed me back. Starting to think seriously about returning this thing to Amazon.I am a pc gamer, and a lot of the work I do is at home online, so I needed a good chair. I had a gaming chair that was just killing my back, so much so that I actually stopped gaming and did the bare minimum for work on my pc. I started looking for a new comfortable gaming chair and just couldn't find one that fit all my needs. I have medical problems so I needed something comfortable, and durable. A friend found this for me and I really liked the look of it. It wasn't a "gaming style" chair, but that was ok by me.The chair arrived super quick which was a plus. The plastic part that encompasses the underside of the chairs workings came broken. One of the snap points was completely broken off. I contacted amazon about it, and they said I could return it for a refund, or return it for a replacement. I wasn't about to go through all the hassle of packing up and shipping out a 70lb chair for a cosmetic piece. They couldn't just send the one part out so I chose neither option. I needed a chair, this one was here, so it just wont look as pretty.Assembly was fine for how heavy this thing is. However, it seems like the left arm rest is higher than the right. Not by much but its noticeable when sitting with both arms on them.All that aside, I absolutely love this chair. It is one of the most comfortable office chairs I have used in a very long time. The seat doesn't feel like it deflates at all even after sitting in it for hours. I can actually sit fully in the chair and use the backrest without feeling any pain, or like I'm reaching out to far. I have had zero problems with the cylinder.My chair might have some small issues, but I'm still very happy with the purchase. If anything changes, I will update this review, but like I said, so far, so good.I'm 6'5" and nearly 300 lbs and this chair is easily the best one I've ever owned. Support and comfort are the words that best describe this chair. The only gripe I have is the same as everyone else, due to the poor design of the arms they are loose. I lock-tited them in but that didn't help. I used the red lock-tite so I'm going to get the stronger stuff to see if that helps.But disappointed. Started to lean to left side a lot. Not as big as I thought. Comfortable but better chairs available for price point