Ordered after seeing TV advert. Was nervous as I would have liked to lie on one first but the money back trial period convinced me. My previous mattress was pure memory foam but  I found I resembled all the stages of evolution as I got out of bed each morning, until I could stand up straight. I  am happy to say that I now get out of bed standing straight after a comfortable night's sleep.
My only criticism is that I would like to have had a mattress cover to keep it clean, but that does not detract from the comfort.