Hi watchtime3,
If you are considering Keetsa I would be cautious and make sure that you can find out the density of any memory foam or polyfoam in their mattresses because some of them use lower quality and less durable materials that would be a weak link in their mattresses.
They are also a Zinus brand that is made in China and some of the comments in post #6 here about mattresses that are made in China may also be worthwhile reading and post #2 here and post #2 here has some additional information about Keetsa that would be worth reading as well.
Phoenix