I got me a Tempurpedic Memory Foam Mattress and after researching to spend a heck of a lot of money on one, I've learned a few things.
1) Not all memory foam is created equal. There are different qualities and materials used. Latex is becoming a cheap substitution, but it's still not as good, being as it doesn't hold its buoyancy (foam compression/decompression) as long as tempur material.
2) Memory foam has different densities. Not all memory foam compresses the same. Usually with cheaper subs, the memory foam doesn't support any body weight; it justs makes it plushy so you feel like it's enveloping you. Realistically, it's the very bottom layer (the support base) that pushes up against you since it doesn't compress much. It's basically like the old egg crate foam you put under your sheets for some added plush. The better ones actually hold a little more weight and can offer better support as they advertise. So for you bigguns, out there, don't fret, you'll only sink as far as the thickness of the memory foam layer, which in this case is 2.5 inches, and a little more for the rest of the foam, but not much. But keep in mind, heavier folk may want to look at higher density foam mattresses as they can hold more weight without completely flattening out.
3) Where's the warranty? Tempurpedic has a 20 year warranty (the last 10 years being prorated) while latex usually has a 10 year warranty. This item doesn't even accept returns. RED FLAG!
4) "To maximize memory foam expansion; remove from packaging within 72 hours of receipt"??? Isn't a memory foam mattress supposed to remember how much it's supposed to expand? If after 72 hours it already starts to shrink, how many good nights do you think you'll get out of this thing? May just be a bad choice of wording by PR, but doesn't sound right to me.
5) Chemical smell comes from even expensive foam mattresses. It's just inevitable. But don't worry, it goes away pretty quick. I slept on my bed the first night I got it, so it's not gonna kill you, but expect it and give it time to breathe.
6) Humidity is not great for the mattress, but honestly, what is humidity good for anyway? I live in south Georgia and it's usually 90%-100% humidity. I don't think the inside of my house is all that humid tho, so it doesn't seem like it affects me too much. But in the end, humidity will lower the life span of memory foam.
7) Memory foam retains heat. That's why they advertise the "ventilation system". Memory foam is temperature sensitive, so the colder it gets, the harder it feels. It's important to regulate the temperature in your bedroom, and don't forget to get some cool bedsheets. Heavy cotton may make it too hot as the foam retains heat and doesn't dissipate it very well.
8) Springiness - Memory foam doesn't have much spring to it at all. Remember the Tempurpedic commercials with the lady jumping on the bed with a wine glass on the other corner? Well, yeah, the foam doesn't bounce much, unless it's a low density foam. Kids can jump all they want, but it'll be quite an exercise since the bed doesn't help them spring back up. I had kids jump on my Tempurpedic and within a minute, they were all tired out. When it comes to adults trying to bounce on the mattress (you know, for adult fun), it does make things a little harder, but one good thing is it's quiet as far as the mattress is concerned. Your frame or bedsprings may still squeak in agony. Since you sink in the foam without much spring back up, you and your partner will sink a bit too and it'll take a bit more effort depending on your choice of position. It makes it a little harder, but you get a lot more comfort for you and your partner.
9) Tempurpedic is EXPENSIVE! So depending on what you want for your money, this mattress may not be a bad idea for something short-term and inexpensive. Usually, just a memory foam topper costs $100+, so if you can get a whole mattress for just another $200, then maybe it may be worth it for you.
Hope this helped, other than just wasting your time.