Jury is still out
Just received this product today and what a difference thiscushion makes in my back pain.  I only used it for a couple giyrs but I could feel the alleviation of pressure off my hips.<br />Its much morevfirm than a foam cushion and is a bit more narrow than I had hoped.<br /> I can tell my posture is much different when using this vs foam.  Definitely  choose to upgrade to the royal as other reviews have said.  I was trying to save money by buying a cheaper version. That's a mistake.  I found the thickness of this one okay I'm more disappointed the width is a couple inches more narrow than my wheelchairs seat.UPDATE:  finding this cushiin very slippery it seems as if the cushion rolls around within the cover adjusting itself on the seat. I think it could be quite dangerous  and end up causing someone to fall off their chair!
Rating: 4 stars