Too firm.  Not good for mature-adult backs.
582488
It seems to be well constructed.  I saw no apparent compromises when compared to store-bought mattresses.

However, for comfort, if I could give this zero stars I would.  But one cannot expect miracles for such a low price.

I'm not a kid, but fifty years old.  And when you're all grown up, with a stiffer back, and that slight curve that forms in the lumbar region as you age, such a firm mattress can cause discomfort, and over time, pain.  After a month with it I just couldn't stand it anymore, was in more and more pain when I got up in the morning, and added a memory-foam mattress topper.  It was either add that or get another mattress.
Other's experience will vary.  If you're young, you'll be fine.  If you've ever had back problems, DO search for individually wrapped independent coils, but get one that isn't as firm.
2907747
After using this for 2 days I have decided that this is far too firm and thin. This is too uncomfortable and does not help my rows. I am returning it.
2038840
This was not comfortable for me. It was very thick. My back ended up hurting. It was just too pillowy. Though I suppose this is a matter of personal preference and not the bed covers fault. It was well made. It was thick enough you could have had guests sleep on it on the floor. I ended but selling it on craigslist.
If you have a bad mattress you should get a new mattress, I don't know how much this will help.
3192200
Too soft and too large for me. I wanted one with more support, this one doesn't tighten enough nor is it firm enough
1430830
The bed itself is good. Expands quickly and doesn't have a bad smell. But if you like soft beds this is not the one for you. It is firm. Too firm.

I'm used to sleeping on a shikibuton on a floor so I'm no stranger to firmness but after two months it's difficult to sleep through the night. I'll be putting this in the guest bedroom and buying something else.
1689716
I love the adjustable bed Part but the mattress is way To firm. Its like a rock. I wake up with back pain.
3622901
I wanted to love this mattress. Unfortunately, it ended up not being supportive enough for my body. I've had consistent back pain on this mattress. For some, it might be a great fit, but my body doesn't agree with it.
4276184
This is a very nice quality pillow, It just wasn't for me, I sleep on my back and this was to high and to firm  I had to send it back
2440043
The description says it offers "maximum support" and it's not kidding. This pillow is SO FIRM. I would have returned it if that was an option, but we're keeping it as an extra pillow for guests. It is small, though I expected as much from a memory foam pillow as that's generally been our experience when buying them. I'd recommend if you're in the market for a firm pillow, but it wasn't my style.
78617
I am not happy with this pillow based on fact that I like a pillow that is soft and sinks down when you lay on it. I sleep on my side, sometimes my back. There are different levels and I ordered the white. It is still too hard for my liking. If you like a pillow that is slightly firm then you would like this pillow. I will be returning this pillow.
4519594
I received this pillow along with a maternity support belt when I was pregnant with twins. The pillow was super cute and the quality was good, but the pillow is much more firm than I was hoping. I ultimately returned the pillow because I couldn't get comfortable with it.
1306164
I really wanted to like this mattress, but  after sleeping  on it for six months,  my back pain is worse. I toss and turn all night and then wake up sore.  It's just too firm.
2787767
This mattress was way too firm. It has no give so while it keeps your body flat, but has no cushion to support your joints.
1461556
The size is good. It is easy to store. But it is not soft enough. It hurts my back, so I return it.
2559600
This pillow is made with excellent quality.  We like the idea that silk is naturally resistant to dust mites.  However, after trying it out for a few minutes we had to return it.  My wife wants a flat firm pillow.  This pillow is flat, but it is very soft and squishy.  So when lying on your back it is almost like not having a pillow at all.  We were disappointed because we really wanted to like this one.  My wife sleeps on her back and side.  Obviously when on your side this pillow will not be adequate.
3396038
Way too firm!  Not comfortable at all, not even for my nine year old.  Need to return.  How do I return a mattress?  :/
874412
This is a lot firmer than I thought.  I purchased it as a topper - extra layer of Gel infused comfort  - for an ikea sofa bed.  But it's way too firm and It didn't provide the level of comfort I was looking to achieve.  Obviously retuning it is too much of a hassle so I gave it away.  The cover is very nice and that's why I gave it 3 stars.  If it wasn't for that I would have rated it with just 2.