The memory foam seat rest is good enough that I still use it. I have an expensive chair that uses a flexible web seat that turned out to be a bit harsh on my bottom.The seat rest has improved this, but not by a lot. It is enough that I use it, which is more than I can say about anything else I have tried. It sticks to the chair, and has no drift. I hardly know it is there, which can be good and bad.I noted that the picture shows a back rest. This is not included. While there is nothing in the text to say there is a back rest, most of us depend on the picture when deciding to buy a product.