There are many great features of this chair. The chair has a mesh back, much like the much more pricey and highly acclaimed Aeron Miller office chairs. The height of the chair back provides adequate lumbar support. Note that this is a "mid-back" chair rather than a "high-back chair," meaning the back of the chair does not extend as far as others do, such as this chair's rival, the Lorell Executive High-Back Chair. Despite this small limitation, the mesh back still contours nicely with the dip in the users' upper and lower spine, encouraging healthy posture. The seat pan is contoured to support one's legs and is comfortable enough for long-term use, but it is made of cloth rather than mesh in more high-end, but pricier chairs. The arm rests are height-adjustable by depressing small buttons on the side that allow them to move up and down freely. By positioning the arm rests at a height that matches the level of the desk's keyboard and mouse, one can protect against developing carpal tunnel syndrome. The horizontal extent of the arm rests is also adjustable, albeit at the time of assembly only, by positioning the arm rests before tightening the bolts and washers with the included Allen wrench. If only one person is the primary user of this chair, then this lack of flexibility is a non-issue. Speaking of assembly, this chair was one of the most difficult and frustrating chairs that I've assembled. Two of the included casters required an unusual amount of force to attach to the bottom plastic swivel-legged base of the chair. The arm rests were very difficult to assemble without a second person's help and dexterity. Lastly, the chair back attaches to the under-carriage assembly beneath the seat pan through a small loop, and a small spring-loaded plastic lock holds the chair back's arm in place in attachment with the seat pan. This lock has a wheel-shaped knob that must be turned counter-clockwise as far as possible with respect to the vantage point of the front of the chair. I found that I had to hold the other side of the spring-loaded plastic "bolt" in place with a pair of pliers to prevent it from also turning with the wheel. Furthermore, if the wheel has not been rotated all of the way counter-clockwise during assembly, then the chair back falls all the way down and is not able to hold its height. A surprisingly large amount of torque is required while turning the plastic knob to prevent this failure mode from occurring. The terse instruction manual did not clearly describe this process (neither in diagrams, nor in prose), and so having to discover all of these stipulations myself first-hand was pretty frustrating. Additionally, several of the threaded screw holes on the bottom of the chair base did not match the included screws as well as they could have, resulting in frustration. Some of this chair's materials/parts seem cheaply made (after all, for a value/bargain like this, one almost expects some cost-cutting to be made by the manufacturer). In particular, the casters, the bottom of the chair base, the sides of the arm rests, and the accordion-style pleated plastic conduit that wraps around the back metal arm connecting the chair back to the seat pan assembly all seem to be budget plastic parts. Meanwhile, the mesh chair back and the seat pan itself seem to be much higher-quality than expected. Unfortunately, to my dismay, many of the plastic parts arrived scuffed and scratched, almost as if parts of this chair were pre-owned by a previous buyer, returned, and inadequately "refurbished" before being sent out in a second (or third!) shipment. The noticeable wear-and-tear was very apparent during assembly. Perhaps I was unlucky and other chairs have shipped in much better condition than mine was in. While disappointed, I am willing to overlook these issues and retain ownership of this chair because of its superior ergonomics. Thankfully, assembly is a one-time process, and so frustrations encountered during chair construction can very easily be forgotten. Properly adjusting the chair is crucial; many problems with ergonomics such as back, neck, and wrist pain originate from improperly adjusted chairs. Thus, it is highly recommended that one adjusts the configuration of this chair to match their body shape and size. You have the ability to adjust the fore and aft pitch angle of the seat pan, along with the forward tilt of the mesh back using two levers. A third lever adjusts the height of the chair itself. Many similarly-priced and more expensive chairs do not have as many adjustments. When properly adjusted, this chair can support hours of comfortable, extended seated desk work without fatigue. Nonetheless, standing and walking breaks at a regular interval are still encouraged. Moreover, adjustments to the desk and repositioning computer peripherals are also encouraged. For example, ensure that the top of the monitor is positioned at eye level to encourage proper neck positioning. This chair has great value. It holds its ground, but still falls short of high-end chairs such as the Steelcase Leap (2) and the Herman Miller Aeron chairs. You can't expect any miracles at this price point, but this chair beats out many other chairs, including much more expensive options, especially if you value ergonomics over style/appearance and "perceived" but unhealthy comfort in the form of softness and excessive form-fitting that encourages your spine to take on a strained, harmful position for extended use. As a small but significant upgrade, consider the aforementioned Lorell chair which is just slightly pricier, but far easier to assemble and supports the full height of the user's back, especially for taller desk workers. Nonetheless, the seat pan on this chair ever-so-slightly edges out that of the Lorell chair in terms of comfort and form-fitting shape. At six feet in height and an owner of both highly-esteemed chairs, I feel that the chair back is tall enough to support my entire back; however, my experience is just one data point. For one thing, I was able to adjust this chair to perfectly match my desk and my body shape/size, and as someone who has developed spinal kyphosis from extended occupational computer use, I can tell you that this chair is perfectly suited for long-duration computer work.