A nice looking mattress that arrives in a box. When released from its wrapping it gently expands to its full size without any jack in the box surprises. 
At first it’s a reasonable hard mattress but softens slightly after a few weeks. It absorbs your weight and springs back into shape immediately you get up from it, clearly it will not sag if you have matched it to your weight. Very easy to sleep on from the first time you lay that the weary head down. 
I am happy with it and consider it value for money.