Bought a Nature's Rest mattress about three years ago from a mattress store that is no longer around. The mattress is now sagging on one side and the company that makes them has problems...seems they were bought out and are now setting up again to deal with apparently many complaints on this brand of mattress. It's a latex mattress. After having difficulties over the years with 2 different Simmons, a local California brand and now the Nature's Rest, I checked out MANY mattress message boards. Seems that the Nature's Rest is NOTED for premature sagging around 3 years or so. Have just bought and received my Flo Bed.....it's a bed you make yourself. Saying that, you can determine the feel you want and the components are shipped to you from Ft. Bragg, CA. There have been only glowing reports about this company and now that we have our bed, I know why. There is a 90 day trial period....you can exchange latex cores during that period to get just the right "feel." It is shipped to you via UPS. Our king arrived in 6 rather large boxes...
You are able to customize each side of the bed to suit the sleeper. Hubby uses extra firm, firm, medium cores, I have firm, medium, soft. It's topped off with either a memory foam topper or latex topper.
Sleeping on this type of latex is different....it sort of feels like you're getting on to firm jello, but the comfort and SUPPORT are amazing. If one core wears, you only have to replace that part and not buy another mattress. For me this is a blessing....and same for hubby....he's tired of mattresses coming and going in our house. Wish I had know of this company (it's been around since 1979) when I lived in CA! Go to flobeds.com and you'll get all sorts of info. Another company that "makes" beds in a similar way is Sleepez.com
Good luck.