I wish I had bought this years ago.
My butt said to me, "This is the best thing you ever bought me.  I sit all day working on a computer monitor.  I was initially worried that this memory foam pillow was too thick. It does compress down to about an inch and a half.  It removes stress off my tuckus.  I weigh a little less than 200 lbs.  I have used this for over a week and I love it.  This review is regarding the seat cushion which is 18" x 14" x 3.6".
Rating: 5 stars