I was hesitant at first but then I saw the 9 000 reviews and I was like whoa something must be right about this! I decided to take the plunge and purchase it. I have not regretted it it's very comfortable and ergonomical while on the PC. I got this for work. Love it!
I'm 5'11" and 175 pounds and this chair is perfect. I was hesitant when reading the bad reviews regarding height and weight affecting the feel of the chair. In my situation that problem was nonexistent. The only issue I had was the headrest but I searched online for the Hyken headrest mod and flipped a plastic piece in the headrest. After doing that the chair is absolutely perfect.
When set to "lock" this chair still leans back a good inch or two from the slightest pressure so if you want to maintain a straight back posture you can't even touch your body to the chair. When you do unlock to lean back the seat also moves WITH the back and puts a lot of pressure onto the back of your thighs. The seat is also curved so if you're bigger than the average person the side of your thighs also might feel pressure. I also had to buy and attach a separate headrest because the default one helped support the bottom of my neck. Even the newer one only gets to the middle of my neck.