Entering into our second time having our mattress replaced under warranty. We bought our King size Simmons Beautyrest Chasewood Firm mattress on 4-15-11 from Mattress Firm in Johnson City, TN. They replaced with a new one on 4-20-12. Just placed a call to have this one replaced as well. Junk! After only 6-8 months they both started to sag terribly, hurting our backs. We will never buy there again! Recommend going to a better retailer. Paid over $1300 for this crap! Also, the management changes frequently at the Johnson City, TN store. Usually not a very good sign.