The Simmons Beautyrest World Class Mattress - is horrible. I thought at first that it was great - very comfortable etc., but not long after I slept on it - maybe a couple of ;months - there was a deep impression in the mattress where I slept. When I talked to the dealer they said the impression had to be over an inch and a half deep!!!! I already felt like I was in a hole and couldn't turn from side to side. I have a bad back and after only 2 and a half years I am to the point that I am going to have to buy a new mattress because the company will not make it right.