I would have given this mattress pad 5* if it had been given a nice layer of super soft cushy memory foam as it would have been sink in comfortable...it is not. It does relieve maybe 95% of my joint pain and back stiffness. For the price though easily being twice the cost of other mattress pads needs more super soft high quality memory foam on top of these awesome coils.Not sure how long it will continue to work as I just purchased it a couple months ago. If it doesn't at least provide the same level of comfort for 2 yrs then I will be back to lower to two stars because of the price...something that expensive should last longer than two years in my opinion, especially in this economy.Received mid day Sunday. Could not wait designated 24-48 hrs to prep for use. Although I can see the importance of prep for ultimate experience before use but my back is hurt..(degenerative disc disease) and experiencing severe arthritis..(getting hip replacement), therefore executive decision was made to install and use ASAP. I'm a side sleeper and my arthritis limits my ability to effectively rest. But this topper is great. If I could I'd put a belt on it and wear it all day ....lol Great product.So, I really don't feel that this mattress topper is worth anywhere near the cost. It's not cooling by any sense of the word. It's not very comfortable compared to other toppers that I've had. I expected it to be supportive, cooling and comfortable but it's really not (at least to me) any of these things. I'd return it but it's really too much trouble to try to cram it back in a bag or box in order to send it back. Not to mention it's heavy! I've slept on this now for about 2 weeks now. At times it's somewhat comfortable but others it seems like it's very uncomfortable. I have not experienced any pain relief as far as my back or hips and my sleep quality has not improved from what I can tell. It does not seem like it's 3 inches tall/deep but I haven't actually measured the depth. You HAVE to use the straps to attach it to your mattress or it will slide all over the place and it is NOT easy to push back into place. As far as the 'special' foam inside, it's kind of stiff but doesn't seem to have any real support, it squishes down a lot under your body weight but feels stiff.I couldn't sleep anymore because of arthritis pain, and our sagging, king-size mattress was just too expensive to replace at the moment. I thought, what the heck, let's give this Dormeo mattress topper a shot as a temporary fix. What a pleasant surprise to find that this was the answer to finally getting a deep and restful, not to mention, pain-free sleep! We looked at other toppers in stores, but nothing looked as well-made as the Dormeo. I'm delighted to say we made the right choice. After two nights to let it "settle", I am pleased to say that I haven't slept this well in years. I would highly recommend the Dormeo mattress topper to anyone who wants to get a better night's sleep.Have had chronic back pain for years, also pain in thighs from hip replacement. Seem to be getting some relief from new mattress topper, but have only been using it for one week, so I need more time to determine if it is really helping!We have a King Sleep Number Bed. This fit right on top, no overhang as some others have suggested, and we've both been having some of our best restful nights since day one! We don't toss and turn as much, which was our issue with our old egg crate foam topper. Temp isn't an issue for us, so I can't address that. But I can say we both feel this was a great purchase, and it was super easy to set up. We did opt for the "walking around on it while it was on the floor" method, and then put it right onto the mattress day one. It actually made our mattress pad and fitted sheet fit better, too. Very pleased with this purchase. Look forward to a good night's sleep every night now.Put this on the bed in my Peterbilt. The egg crate foam was terrible. First night out was such a great sleep. Well worth the money.I purchase this topper for my foam bed which started giving me lower back pain and makes me flop like a fish at night due to the heat. I would only get about 4-5 hours sleep every night. I thought foam beds were supposed to conform to our body and cooling gel was supposed to keep cool. Omg with this topper I can put it on a brick bed and still be comfortable to sleep on. I sleep on my back and now I wake up 9 hours later in the same position with no back pain and no flopping around. I also got the Dormeo low profile pillow also which I think should be purchase together to achieve the maximum performance of the topper. I don't know how long the comfort of this topper will last but I will not hesitate to purchase another one.