This review will address packaging/shipping/delivery, parts, assembly, function & usage, and overall impressions.Packaging: Double-boxed (very sturdy manufacturer/CYKOV box fits snugly inside a heavy-duty Amazon box), both fully intact; no visible damage, watermarks, etc. No shipping or delivery issues.Parts: All parts are present, individually packaged and depicted in photos in an assembly instructions booklet. The welds on the steel base look good. White cotton gloves are included--a nice touch of class. Small parts (screws. bolts, washers, etc.) to include a 5mm T-handled Allen wrench, are vacuum sealed on a blister pack card.Now here's a very nice consideration on the part of the manufacturer, CYKOV; each of the fasteners (bolts, screws, etc,) includes an extra one in its respective blister pack--now that's proactive customer service, and very appreciated. I didn't lose any in the ensuing assembly process--but, I'll admit to having been there on occasion.Assembly: The assembly instructions booklet is very clear and overall very good. All parts are identified in photos. Following the step-by-step instructions w/photos is not the least bit challenging. You need no more tools or fasteners than what are provided. One thing I found that was not mentioned in the instruction booklet was that the right-side arm and bracket, each bagged separately, were each secured with yellow tape on their protective bags--no doubt to differentiate from the left-side arm and bracket which were secured with clear tape. Very thoughtful, that likely precludes a potential mix-up during assembly. Following the instructions, full assembly took me less than one hour (including a leisurely coffee break).Function & Usage: Seat padding is firm, but comfortable; padding on the arms is less firm, yet quite good. The overall range of motion is as expected; the 360* rotation and rocking (fore & aft) are smooth. Hydraulic elevation (up & down) is firm and consistent. The actuator arm can also move in/out to lock/unlock the hydraulic cylinder, and can even lock in a reclining position. Reclining resistance is, of course, adjustable. No matter the attitude of the position, the chair feels very stable. For routine office applications, this chair will meet all needs in a firm yet comfortable manner. The adjustable lumbar is wider and more supportive than I expected--very well done. Overall I find this chair quite comfortable, especially as it encourages good posture and thus tends to diminish stiffness and fatigue.On a personal note . . . For me, as a guitarist, the flip-up arms are a godsend. It's tough to maintain good posture during extended practice/playing sessions when the lower bout of your instrument is constantly bumping a fixed armrest. Now I don't have to give that perpetual annoyance a second thought. Yes, I am very pleased with this chair. If you are in need of such a versatile chair, this one will not disappoint.