I read reviews, but even w/ much research, there was still a bit of trepidation, for... it's a mattress, and i couldn't squeeze and lie on it to check it out. But after the first night's sleep, I was sold. I've recommended buying this mattress to everyone I know. And everyone who has ever even touched the thing has fallen in love. I've had this for well over a year, verging on two years and it's still as good as new! Before this mattress i had NEVER slept on any mattress that I didn't wake up stiff (i have a few minor back issues). Now I rarely feel pain in the mornings. And when I'm out of town, I cannot wait to get back into my own bed! This is now a source of rest and refuge. Whenever i feel strained, i just lie down and let my body sink in and relax. When others lie next to me, i cannot feel them move at all. It's like the bowling ball bit, but soooo much better. When i move up in size, i will keep this for guests and invest in the same thing. A small investment, too! Seriously. People's jaws drop when i tell them of the steal i got, and with such inexpensive shipping! Overstock has found a new junkie! I will always check here first.
Precautions: It is a bit stiff. I don't mind, but some do mention that. It takes a few moments to truly sink in. I have a delightful down mattress pad on it, so you may want to do the same, just to ease initial shock, or invest in a slightly softer version of this one. Also, it magnifies body heat. This is great for cold sleepers, but something to be aware of if you're like me, a personal heater. :)