The Genie Mid-back Mesh Task Chair is a comfortable chair.  It supports me well and provides the extra back support I've been wanting in a chair (while being flexible enough to lean back a little).  I am able to raise and lower the chair according to the height of the table or desk where I'm sitting.  It also glides well on my carpet mat.  One less star because the arms are a little low and I can't adjust them to my height which is only 5'3".  We bought 3 for our school's director, assistant director and myself (admin asst) and we all have the same review.  Other than the arms, we're enjoying our new chairs.