I usually never review the things I buy- I'm an obsessive researcher and am hardly ever disappointed with a purchase. Same case applies here, except I HAD to express it. Let me start by saying that we've had another brand of memory foam mattress for about five years. We've been happy with it but, as it goes with most mattresses, after five years things are just not the same- especially on a mattress that you don't flip (I don't care what the name brands say about lasting forever- I don't buy it- nothing lasts forever in our consumerist society- otherwise they would run out of people to sell to). Anyway, after five years it was sagging a bit but I wasn't keen on replacing it just yet, it still did it's job, until I got pregnant. I have pretty bad arthritis in my lower back, a very moderate curve from almost 15 years of pounding it on horseback and generally being overly athletic. I've maintained the arthritis through diligent PT and exercise- and up until the pregnancy was able to ride and do all the things I love. I'm 7 and a half months pregnant now, and my back has been giving me trouble for months- because your hormones just do things to you that prevent a lot of exercise, especially if you have a pre-existing condition- and forget doing any core work! I haven't slept in months, my lower back has been in so much pain, and the pregnancy- well as the belly gets bigger it is impossible to stay in one position for more than an hour or so. I wake up with constant achiness in my hips and low back area. I bought this mattress thinking "it can't get worse" and gave our old one to my teenage sister. I just woke up from the first night- and for the first time in a very very long time I slept through the night! I woke up with no pain! It filled in all of the spots on my back- including my crazy lower spine that almost nothing every filled in. It cradled my big pregnant belly and the baby didn't squirm and push into my side from the pressure of me being on my side. I didn't even move for half the night, when I finally flipped to the other side just for the sake of it. I did not want to get out of bed this morning because I was so comfortable! I finally didn't have to go through a rotating pile of pillows that I readjust and position throughout the night just to sleep! Based on other reviews I bought the softest, in the hopes that it would finally "fill in" the curve in my lower back and it is perfect! The perfect amount of support and comfort. I feel rested- which is amazing considering I'm definitely in that phase of my pregnancy where I am super uncomfortable a lot of the time. It is not too hot- our old one was actually kind of hot, but this one isn't at all. I'm only 5'4" and pre-pregnancy 120lb, if you are petite like me and really want it to "hug" you, I would definitely get the softest because you might not weigh enough to fully sink in on the others. We will see how it holds up, but considering our other one was not nearly as nice- I'm guessing we'll get five years or more, and if that's the case, I have no qualms about ordering another one. By then, they'll have some other amazing thing out anyway!