(Get the corner desk ($100) in the picture for $80 when purchased together https://offerup.com/item/detail/886149415/) You can lean back with perfect balance, as the tilt tension mechanism automatically adjusts the resistance to suit your weight and movements.  You sit comfortably since the chair is adjustable in height.  Your back gets support and extra relief from the built-in lumbar support.  The safety casters have a pressure-sensitive brake mechanism that keeps the chair in place when you stand up, and releases automatically when you sit down.  Relieves strain on your arms and shoulders. The casters are rubber coated to run smoothly on any type of floor.  Increased stability since the tilt function is lockable when the backrest is in the upright position.