I am truly happy with is topper. I bought one in a twin and was using it on top of a 25 yr old spring mattress. It was ok for awhile, but me being EXTREMELY sensitive to ANY kind of pressure, this topper by itself, just wasn’t relieving all the pain and discomfort from the serious inflammation I was having. I was waking up in extreme pain that lasted all day. It was like being in a torture chamber. It was actually my 25 yr old spring mattress, NOT the topper, but only because my sensitivity to pressure has been increasing over time. So, after all toppers I was using in combination, weren’t solving my issue, I broke down and bought a new pillow top mattress…..and used this topper on top. I did dip down… but I felt no pain. ….. So as long as I had no pain, a bit of dipping down, didn’t bother me….. My main objective had been achieved.. But truth be told, I actually needed this topper in king size. So I resorted to my former 2yr old—- 4 in memory foam, and still I woke up in extreme pain. This was starting to really concern me as to what my future held from a medical standpoint. So, I order this in a KING size and, I kid you not, I can HONESTLY say, I am pain free from pressure issues. Note: the twin I ordered about 4 months ago, has more pronounced indentations in the pattern, which causes a deeper dip in the topper. That is probably why the structure of the foam is weakened and causes it to separate more quickly with use. A good additional 4in fiber filled mattress topper on top will probably decrease the amount of pressure and friction on top of the memory foam helping to extend it’s lifespan. I just ordered the KING size and the indentations in the pattern aren’t as deep, and you don’t sink as much. I hardly sink, just a little bit. …….But as long it still provides me with a totally pain free sleep/rest experience, …….I am telling you, I am more than happy. It has taken not only the physical stress off, all of the sensitivity to pressure, but the mental stress in having to deal with the medical aspect involved. So I now I see that not all memory foam is created equal, in providing the benefit I needed. This one did it for me. I do have a really cool ???? mattress pad with a thin layer of memory foam inside of it as well, over the memory foam topper…... (it is kind of broken up in sections-kinda strange-but, hey it works)…… We will see how log it lasts, I will try and give an update. If I don’t update in about 4-6 months, it means all is still good. So for the price, it is worth it to me. I hope it helps others with pressure issues, as it has helped me.