Sleep great for a month, then awful later.

I have back problems, have had for years. I bought the most firm mattress Southerland makes. I have to have really firm, I can't sleep on anything else because of the aforementioned back problems. The mattress slept great for a little over a month, but after that it went quickly down hill. With loss of firmness, a sunk in spot in the middle section. I read the directions that came with the mattress, I turned it around it every other week or so. You can't flip it, it can only be spun. I only sleep on it I never set on it, use it to watch TV or anything else. And my back hurts worse after a sleeping on it, than any other mattress I've ever had. It sleeps great for like a month or two, and then the memory foam, starts collapsing. And offers no support at all. And good luck trying to return it or getting your money back. I had never heard of this brand before, that day when I walked into the store. And yes I did lay on their samples they had in the store. But like I said mine felt great for a few weeks, and so did the displays they had in the store. But it doesn't last, and you will be sorry for buying this mattress brand. I wish I had read the reviews of this mattress before I had bought it. They all say pretty much the same as my review, lesson learned. I will never buy a mattress again without reading the online reviews first.