5 might seem OTT but frankly this item is what it says it is, it is as described and it got to me in 2 working days :)
The mattress comes in a worryingly compact three foot tall box, about a foot on the sides, it's vacuum packed for compactness. It apparently takes up to 24hrs to reform, but it looked and was fine that very night. Nice 3 inches of memory foam on a good, solid foam base. Wonderful to sleep on!
The removable cover top was a yellow velour affair with polyester base studded with dimples. It was quite nice and feels nice to sleep on. At £80 this is a total steal, also did I mention it's wonderful to sleep on?