I purchased this to replace a 4-year-old 10" medium gel memory foam mattress by Lucid that had begun to lose support in the middle, though it was still comfortable. A lot of reviews said this one was slightly firmer for a medium, so I liked that and thought it might hold up better. The design is pretty, and it is firmer like the other reviewers say, but it started kind of sagging in the middle already after only a couple of weeks using it, and it is NOT as comfortable as my old one. Returning is a total pain, but I will be sending this one back and plan to re-purchase the same Lucid mattress that I had before.  Sorry, I tried. Thanks.