Here comes another, very detailed, review from the PICKY CONSUMER !!!! First let me say that I have shopped foam Mattresses for a few years, quality is a BIG variable, but I can't say that spending $3,000 on a TempurPedic will really get you much more than a Big Name and a Longer, but hard to enforce Warranty. This warranty is for 5 years and I can't say, at this point, if the mattress will outlast that limitation. One has to look at factors. $3,000 gets you 15 years of warranty and difficulty returning and proving complaints. Around $300 gets you 5 years and the ability to change your mind or go for NEW Prototype they may have by then. YOU do the math.... I called in about who manufactured this mattress, but was given inconclusive answer. The answer is-- Advanced Urethane Technologies in West Chicago IL, USA. These Mattresses are PROTOTYPE SAMPLES...meaning they probably are using our sales and responses as a key to quality and testing before they are released onto Main Market under some nice name. Since that is the case...I HOPE someone from the Manufacturing Company reads this review so that they might tweak things. Packaging was adequate, BUT corners do get crushed in packing wrap and transport which throws the balance off on the mattress for about 2 weeks..eventually it should rise, but will have a pressure mark indefinately. It weighs 40lbs 8 ozs. My mattress was manufactured July 23, 2007...so it was Fresh...including the overwhelming, and still damp, adhesive glue smell . I unwrapped it....Took OFF the zippered cover, and let it breathe overnight...then I used citrus fabric spray to lessen smell and resprayed for 2 days, ( DO NOT SPRAY DIRECTLY ON FOAM...it will break down fibers). The mattress is made in USA of 56% Conventional Polyurethane (base) which is of lower density rating than the upper 44% Visco-Elastic Polyurethane. Making it FIRM, which bothered me for a week, I have Nerve problems, Sciatica, but my spine and vascular system adjusted to the change and are now in better working order than they were on a Select Comfort with 4 inches of Memory Foam on top. If you are ultra-sensitive, as I am, it will take a little while, but you will adjust. Perhaps they are actually onto something by making the upper part more dense than lower--this may be what stops the sinking effect on Memory Foam...? I waited to write this until I had experienced use for a few weeks to see if there would be a problem to report, as you may read, there hasn't been. This mattress is made to be used on a Platform bed, not with a Boxspring or other foundation. It meets the stringent CA Flammability Requirements, but ONLY without Foundation. I am using it with a Foundation and it is working fine...no sinking or lumpiness at all. Now for hints to Manufacturer QC-- The cover, made in China, is a Horrible yellowish Beige and makes the mattress look dirty. It is more yellowed in some areas than others, which makes it look old and detracts from the clean crisp whiteness of the cover on foam. PLEASE tell wherehouse to STOP writing foam codes, with marker ,onto outer wrapping shell...the ink bleeds through to foam and out to cover and SHOWS right through the outer cover. If it was small and a few numbers that would be one thing, but 3 feet of huge numerals is a bit much, don't ya think? One should put a quilted mattress pad over the covers provided...the fake suede cover will make you hot and sticks to sheets. Dimensions are listed as standard size 54x 75X 8, for the Full I purchased, but the actual dimensions I received are 53 X 72 X 9..I really would have preferred to have the length, so as to fit in Frame of Bed without having to camoflague the shortness with pillows, than to have the extra inch of thickness. So QC needs to be double checking dimensions and a different supplier for outer cover would be a Good move, a Crisp White Cover would be so much better and COTTEN wouldn't hurt.. Overall...this is a GOOD mattress, it takes a little work, but that's what I've found with everything from Overstock, but for the money you will spend it is worth it !!!! Hope I covered all the questions you might have...ENJOY !!!"