This is one of the best purchases I have ever made! It's super comfortable and I sleep better than I ever have. I replaced a $4000 mattress with it and I do not regret it one bit. There was no off gassing and it fully expanded in less than 12 hours.

Yes, this is firm. I had aches and pains when I slept on this for the 1st time that I have never had before. I IMMEDATELY BOUGHT a topper and this has worked well. They are sold here and at Wal-Mart. If side sleeper, this is a MUST!

This mattress was delivered Saturday and was all I had hoped it would be. It is extremely comfortable. I sleep very well. I am very happy with my purchase.

We bought the full size. The moment we opened we saw a stain in the upper part of the mattress. The mattress started to expand very slowly and was clear that something was wrong with it. The mattress didn't exapand fully, on some parts the foam is crushed with low spots. The middle of the mattres is arched. In both the head part and leg part there are low spots where the foam has expanded only to 6 inches. The support foam in those areas is very solid when you touch and is like half an inch thick. Poor quality total junk. It is not the first time that the mattress in a box we buy from sam's is of low quality. But the Molecule is the worst of them all. Sam's needs to to check the products from those company. You can't sell low quality mattresses for $500. Don't buy a mattress online, go at a store and test it out before bying.

i was looking forward to this mattress after reading all the raving reviews. however. when i rolled it out it only inflated to 10" not 12", i called sams club and they were supposed to start the refund and i had to call again. I could not reach anyone from molecule after leaving messages for days. Now the mattress is eminating a bad gassing smell that is infiltrating my entire house making it hard to breathe. I called sams again and they said they started the refund.

Love it!!

Wife loves the new bed..

I absolutely love this mattress. It is extremely soft and easy on the back while having a sort of firmness to it. It is so perfect!

I purchased 2 of these mattresses for a vacation home. I did sleep well on them at first for a 2 week time frame. Last summer I spent 2 months straight and woke up with shoulder and neck pain. This summer it's even worse - I ended up having to buy a memory foam topper. This mattress has less than 200 night of us sleeping on it. Starting to have sink spots and the fabric on the top pills. I can't recommend purchasing this mattress - I have another mattress that I purchase from Sam's club that has lasted and out performs this one.

Doesn't get beyond 10" like another reviewer posted. It definitely puts out an odor. Comfort level is decent but not great.