I bought this mattress based on all the positive reviews it has had and the reasonable price. However I've only been sleeping on it for 11 nights and the mattress has begun to sink in the middle, this means I am unable to lie on the sides of the mattress as I just roll into the middle and it hurts my back because I am sleeping in a pit. I am a 10 stone female sleeping on it by myself so I don't understand why it has sunk so considerably with so little use.

Please don't waste your money and just buy a mattress elsewhere.