Good for computer chairs
I bought one of these for my home computer chair (spend a lot of time sitting) and liked it so much that I bought two more--one for my office chair and one for the car.  Again I've found they work great on the computer chairs, but not so well for the car.  The problem there is the pad is enough smaller than the car seat that the edges press on parts of the legs that is not initially comfortable.  Sitting for a while seems to overcome this initial discomfort.  The only other problem I've had is that with one of the three pads the fabric cover that has a open mesh pattern on one side was not cut well and consequently I'm getting a lot of little fabric pieces (the cut-outs) shedding from the cover.  Not a big problem and the cover itself is not decaying, just annoying.
Rating: 4 stars