The Beautyrest Silver Extra Firm BRS900 is an excellent mattress! The mattress is extra firm as it states but it provides magnificent support for the spine and joints while sleeping.  My husband and I were having alot of back issues and joint pain with our previous mattress so we decided to purchase a new firm mattress to get rid of joint pain and this new mattress does not disappoint.  Our sleep quality has improve tremendously within days of having this new matress.  My husband and I sleep alot longer and better throughout the night.  My joint pain has reduced down tremendously to very little pain and my husband is not having anymore joint pains at all.  Also my husband snores loudly and his snore has even became really low to the point  that I can sleep more peacefully. I rate the mattress a 10/10 because my husband and I have better health and better sleep quality due to purchasing this new mattress.