This mattress holds up to all of its reviews. I wanted to replace my old pillow-top with one of the latest boxed versions to try it out. I was always skeptical of the ones that are just foam because, just like foam pillows, eventually they lose their shape and go flat. I also did my research and read that if you're going for a boxed mattress that you want a lot of years out of, look for a hybrid one that's firm. They stated that firm over time with these mattresses will give you a medium-firm level and then medium. This mattress has no chemical smell at all and once it started to deflate was 12" within four hours, but we waited the whole 24 hours anyway. This mattress also gets bonus points for having a cover that can be unzipped and washed.