Works as it should but take warning before you buy to use with your office chair.
This things protects your butt like it should, but it's also about one and a half inches thick.  It therefor messed-up the ergonomics of my chair:  the armrest is no longer high enough to support my elbow on my right arm while it runs a mouse ten+ hours a day.  I know from previous experience what no elbow support on mouse hand leads to excruciating pain in that shoulder.  Also, by raising me that much the angle of my view of my monitor is messed up and the angle of my knees to the floor is wrong.<br /><br />Like I said, it works, but be aware of how it will alter your sitting position.
Rating: 3 stars