Sags fast! No help from Sealy. Don't buy!

Absolutely disappointed in this mattress. I bought it used from a young woman who only had it for a few months. Only a few months in, we noticed that it was sagging on both sides and the ends. My partner basically rolls off the bed and I roll with him! He's 220 lbs and in 120. When I contacted both the store and Sealy directly, neither could help because the warranty isn't extended to a second buyer which is understandable, but you would think that Sealy would stand behind their product that was just over a year old. Very disappointed and will never promote this brand.