Amazing!!!!
As a person with MS and someone who is short. Most chairs are uncomfortable about 4 hrs in.  This is perfect it keeps chairs from cutting into the backs of my legs and cutting off my circulation. I frequently can end up working for 12-20 hours at a time this cushion immediately stopped my back pain and leg pain. Allowing me to work these hours without an issue. I might have to buy the mattress.
Rating: 5 stars