这个床垫怎么样?

有谁用过costco这个memory foam mattress by sleep science床垫? 怎么样? 父母亲要来了, 想给他们买个好床垫

http://www.costco.com/Browse/Product.aspx?Prodid=11484961&search=memory foam&Mo=56&cm_re=1_en-_-Top_Left_Nav-_-Top_search&lang=en-US&Nr=P_CatalogName:BC&Sp=S&N=5000043&whse=BC&Dx=mode+matchallpartial&Ntk=Text_Search&Dr=P_CatalogName:BC&Ne=4000000&D=memory foam&Ntt=memory foam&No=51&Ntx=mode+matchallpartial&Nty=1&topnav=&s=1