I've not been happy with my Beautyrest World Class "Luxury Firm" Everett Queen and am replacing it at 7 years due to sagging and back pain. I'm a side sleeper with back pain whenever I sleep on a too soft mattress. Is a standard line Stearns and Foster "Ultra-firm" tight top like the Jossette a best choice or is it too firm for any side sleeper? I'm concerned any of the S-F luxury firms will break down again and will Sag like my Everette. I'm a male 5' 9 and 160 lbs and my wife is a side sleeper and 130 lbs. (By the way is the Beautyrest sagging at 7 years worth trying to enforce the 10 yr warranty--it has all tags and is spotless under a mattress cover.) Thanks for making this site available. I grew up in a family specialty retail shoebusiness and that level, your level, of professionalism has almost disappeared.