Nearly perfect
I develop software for 12 hours a day on my butt. That causes literal pain in the 'butt' and a sore back. I've been using this cushion for a week and love it. Only one complaint that I've heard from others and I've been bugged about. Even though the cover has the rubber nubs on the bottom, the cushion has a tendency to slide off  my cloth cushion office chair. I have an app that reminds me to stand up every 45min. I have to reposition the cushion. My wife wants my cushion.
Rating: 5 stars