I bought this mattress 2 months ago. I did not need a new one but was waking with back ache on my old one. I watched the adverts on this product and bought based on the claims of quality and science based on a good nights sleep. 
There has been very little difference from this one to my expensive latex mattress that I already had. Still experience back and neck pain on waking so all in all not worth the money. Glad I did not pay full price.