First the good: The chair mesh is reasonable especially at this price. The arm rests are relatively easy to adjust one you get out your screwdriver (this should not require a screwdriver though) the height is easily adjustable and well positioned. The Bad: This chair even when locked is angled WAY too far back. You should sit between a 90-100 degree bend. This is much closer to 110-115. Doesn't sound like much but it is a huge difference in posture. The lumbar support is not even helpful in those ranges. Aside from that there is no way to adjust the seat position relative to your back so if your legs are short or long you are out of luck. Also the tilt lock mechanism can actually bite your hand pretty good the way it slides in and out. Oh and one more thing the tension mechanism doesn't seem to actually do anything.
I've owned many office chairs in my life and while I may not be able to discern certain subtleties I can say for certain that a mesh chair is a far better choice than a solid vinyl/leather one in my estimation. This particular unit is comfortable and offer all the adjustments I nee for my uses. I've owned many office chairs in my lifetime an this one is far and away at the top of the list for comfort.