I got a full one not some crappy topper mattress padding. Thing is heavy as hell. There's a few things I like and don't like about it. The fact that it doesn't transfer motion is both good and bad. You won't disturb whoever is sleeping alongisde when you get in or out of bed. But is also reduces the rebound effect you get from spring mattresses so it makes sex a bit more of an endurance workout. It also retains heat which is nice in the winter but not so in the summer. It doesn't really improve sleep for me but I do toss and turn less. I can actually sleep on my side without my arm going numb. Overall it seems better than a conventional spring mattress but I actually get a better night's sleep on the couch of all things.