I bought this mattress in the sale, spent about £ 100 extra get a good quality one. We have not slept on it yet as we are waiting on our new bed that we ordered from Wayfair which has turned up today. The mattress looks good quality, thick and heavy so money well spent here. 
This is a word of warning for the delivery though, The delivery company who delivered will not remove shows to come to into your house. They delivered it upstairs to my bedroom and left grease marks from their shoes on my new carpets on my stairs and through to my bedroom. The mattress was also a little dusty/dirty from storage from the ware house. 
This would have got a 5 stars except for the delivery which let  down !