Purchased the soft Vinyasa in 2008, despite lying on it in the store, was too soft to sleep in and hurt my back, and quickly exchanged it for the firm. Enjoyed the bed very much until about 2012, when I started getting lower back pain. Thought maybe I had arthritis, never thought it was my semi-new mattress. Stopped sleeping in it about a year ago and lower back pain disappeared. Went back to City Mattress, they suggested a solid board underneath rather than a slat foundation, this did not work. Can get 20% off a new mattress if I wanted to spend a fortune for another 4 years.