I was originally going to leave a 4-star review but their level of support changed my mind to 5! I purchased this chair in March '21 to use it as my office chair since I am working from home a majority of the time. I sit in it 7-8 hours a day and do not feel any soreness at the end of the day! I am 5'9", 215lbs and this chair fits comfortably! The lumbar support is excellent for long hours of sitting. After almost 2 months of using it consistently, it developed a loud squeak on the tilting mechanism. This chair it seems is better balanced when your center of gravity is shifted toward the back of the seat. Leaning forward seems like it puts a lot of tension on the tilt system, more than leaning back.
I contacted support about the squeak. They were quick to respond (within 24hrs), extremely helpful, and friendly. They sent out a replacement part and it was easy to replace. The squeak is gone, good as new!