Hi CHERYL.
You can see my thoughts about mattress reviews and why they are among the worst ways to choose a mattress (unlike other types of products) in post #13 here.
They do have a great return policy (120 days) but unfortunately that’s not nearly long enough to give an indication about the durability of the materials and if the lower density memory foam they use softens prematurely and you lose the comfort and support that was the reason you bought it in the first place then this wouldn’t be covered by the warranty (see post #174 here).
Having said all that … as long as you’ve done your research and are aware of and OK with the higher risks and lower durability involved in choosing a mattress that uses lower density and less durable memory foam then that’s what is most important. At least you are making an informed purchase and are aware of the higher risks involved in what you are buying ahead of time.
Phoenix