I bought this mattress in December of 2008... it showed up on time, was thick and plump, and felt great to sleep on the first couple of months. Truthfully, AT FIRST there was not a big sinking-feeling, even when it got warm, and it didn't even feel like a *true* memory foam mattress (Temperpedic's that I've tried in the store)... sure it doesn't cost like one either.... But over the last year the mattress has gotten weaker and weaker - the material inside of it is broken down and you can't sit on it for more than 30 seconds before the whole mattress begins caving into you. When I sleep, the mattress caves in - in the middle - and I weight 190 (6'1). I bought this mattress to support my back injury that I sustained years ago - thinking it would help... boy was I wrong. I've slept on at least 10 other mattresses through travel that ARE NOT MEMORY FOAM but provide WAYYY better sleep than this thing. If you are single, it might be great because as one side begins to sink, then you can roll over to the other side of the bed. Mind you, the other side of the bed is usually sunken in as well, and this mattress is just a cheap version of what I should have bought in the first place. When I spoke to someone at the actual temperpedic store about it, he said that this is a common problem with a lot of the cheaper mattresses - the material begins to break down after a year or even a few months in some cases - depending on the heat... same conversation with the guy at the sleep number store, who had a Temperpedic. I would not waste my money on this mattress again - it has been terrible for my back (AGAIN THIS IS AFTER A YEAR+ OF USE) and in the end, I wish I took the ***** bucks and used it on a better mattress from **** like my friend - I lay down on his bed sometimes and just fall asleep immediately, no tossing, turning, or looking for an unsunken area on the bed. I fell asleep at 3am last night and got up at 7am because of the quality of sleep I get from this thing. That's the truth, and again - this is an aged review - not bent on the smell, shape, size, or weight of the dumb thing.