JenPen, I would say you are overdue for a new mattress. I got a new mattress and box springs in Sept. and am not really happy with it. Actually, I exchanged the one I originally selected, but am not happy with the second one, either. I wish now that I had gone to Sears and gotten what I'd had the previous 18 yrs., a Spring Air Back Supporter mattress & foundation. I need a firm mattress and this one really was great. I did have an egg crate mattress on it for some years, as my ex-husband and then ex-b.f. both found it too hard. Everything these days seems to come with a "pillow top." I don't like them at all--they just feel lumpy to my body when I lay on them--but that's what I got as that's all that Mattress Firm had in my price range.
Whatever you get, be sure there is a full refund or exchange policy at the store where you purchase it.
Did you get the 3000, 4000, 5000, model? The reason I asked is they were equipped with a different air inflation station, opposed to the 6,7 and 8000 models. The pumps were faulty, not the mattresses. The maker of those "pumps" went belly-up! We did spend ALOT of money and IMHO sleeping with my spouse again is worth all the money in the world. Like the saying goes different stokes for different folks. We (I) tried the Therapeutic, Simmons Best, Space Shuttle Memory Mattress, etc....It took 2 years and around 6K for me to finally find comfort. The base moves too if you happen to wake, as I do, to allow you to shift in different positions. This comes in extremely handy for my back! Lifetime guarantee and they had financing available (I think?)