Horrible Sleep~~Waste Of $$!!

We bought this bed a year and a half ago after sleeping on a Sealy for more than 8 years~~should've saved our money and kept the old bed! Within 6 months of purchasing this set, it sags where my husband and I sleep which causes a bump in the middle of the bed~~we "flipped" it regularly(end to end) as the top is the only part that is memory foam. We were not getting restful sleep at all and we both increased our visits to our chiropractor to try to adjust to it. To no avail, it's impossible to get a good nights sleep when your head and feet are at different heights due to the sagging! It has gotten so bad that we finally gave up and flipped it completely over(yes, now the fancy cashmere/memory foam top is facing the box springs and we put a Brookstone Bio-Sense Bed Topper on what is the bottom of the mattress to regain some sort of support. We spent a great deal of money on this bed and I will NEVER purchase from Spring Air again! The only thing saving it at this point is the topper. DON'T WASTE YOUR MONEY ON THIS BED!!