We have had this mattress (12" Serta Sleep-to-go) for about 2 weeks. We bought it to replace a very old sagging pillow top spring mattress in our master bedroom. We were not a fan of the pillow top and have liked firmer beds in the past, so the negative reviews did not scare us. I should note that we have a sleep number in our other bedroom and are happy with it, but it's not great for non-sleeping activities, so we were hoping for an alternative.
Shipping wise, the bed came on a Monday instead of the previous Friday that was estimated via email, but that didn't bother us. The box it came in was missing a wheel and part of the box was torn, but again that didn't bother us either. It was easy to unroll and unfold and it fluffed up to almost 12" almost immediately after unrolling it (12" on one side, 11 3/4" on the other an hour in). It had a not pleasant off-gassing smell, so we slept elsewhere the first night, turned on the exhaust fan in the connecting bathroom, and tried it the following night.
My experience and my husband's experience on the bed were completely different. I am about 36 years old, 5' 8" tall, and 120 lbs and have slept well on any bed my whole life, cheap hotels included. Every night I slept on this bed I had extreme problems falling asleep (took more than 2 hours each night), woke up pretty close to every hour, and woke up sore through my shoulders, neck, and back in the mornings. I stuck it out for more than 10 days trying different pillows, positions (I sleep on my side, back, and occasionally my stomach), and switching sides of the bed with my husband. There was only very minimal improvement if any and I was still waking up frequently through the night and having numbness and soreness in my elbows and knees, which I've never experienced before. I stopped trying when I got a debilitating headache that lasted 8 hours and seemed to stem from the neck/shoulder/back pain and tightness (my first non-migraine headache in over 20 years). Needless to say, we will be returning the bed.
My husband is also 36 years old, just over 6' tall, and weighs about 230 lbs. He generally sleeps on his side, and sometimes his stomach or back. He literally has had the best two weeks of sleep in his entire life on this bed. For the 17 years I have known him, he has always had problems sleeping - waking up in the middle of the night, getting up at 5:00 am because he can't get back to sleep, and basically living life in a state of semi-exhaustion. In contrast, on this bed, he has slept like a baby, almost overslept for work at 7:00 am, and says he feels rested and wonderful in the mornings. If we could cut the bed in half, we would.
So if you are considering the bed...flip a coin?