Uncomfortable - Definitely not worth the price.
Purchased to make an office chair "more comfortable". It actually made it more uncomfortable. The dimensions of the " ULTIMATE" are 23" x 18. This model is relatively gigantic. We both found it uncomfortable after just a few "sittings" and are happy to be returning it. This experience has also helped us decide the we DO NOT want a PURPLE mattress either. Lesson learned. YMMV
Rating: 1 stars