Invaluable to this truck driver!
I am an over-the-road truck driver that permanently injured my back and hips a few years ago.  I really do NEED this seat cushion to mitigate the beating my body takes from driving all day every day, in particular my compromised back and hips.  I had the regular Purple seat cushion that I got for free with the order of a Purple mattress, it is okay but just didn't do enough for me.  The Ultimate Seat cushion is an investment that has been worth every penny to me.  I also have the Purple back/lumbar cushion and a Purple Hybrid (aka Purple 2) mattress, both of which I am very happy with.
Rating: 5 stars