We,like others,bought a firm mattress and after months it hasn't soften up like we hoped...found this on a google search and after reading many reviews on different brands decided on this one to see if it would help. As soon as it came out of the pkg we knew it would as it was so soft and lush.We slept so much better from the first night and now a week later we love it ! Worth every penny ! Tip for split king with adjustable base-you don't need to buy 2 XL twins as the strechy border fits well under the mattress and hasn't pulled off even when we position each twin differently.It also gets rid off the space where the 2 mattress meet down the middle (atleast that has been our experience)