This is my 3rd one in 20 years here! I LOVE these toppers! Truthfully, I have not bought a new regular mattress in 20 yrs either. My regular mattress is a pillow top and I now longer use the box springs. I have a the 4" topper on top of the pillow top mattress which sits on a "Dura Bed Frame" Sold here on O. A much cheaper option than the fancy solid foam mattress systems that sell for lots and lots of money. I have compared my bed to friends and family that have those $1K++ beds and I LOVE mine just as much....and they have slept on mine and can NOT believe they spent the money they did for the same sleep comfort as my DIY set up.
That said, if you are transitioning from a regular mattress there are some differences such as heat. I bought this "Gel Infused", dont bother spending the extra money, it is not different then the other ones.....without the gel. Foam toppers are a little warmer than regular mattress's. I use an an all cotton cover and that helps a lot. Then, you have to be knowledgeable about the foams density, the higher the density, the firmer the matress. I could have gone a tiny bit firmer with this one, it is still comfy soft with firmness but I believe it is preference. So, if you do not know what your density preference is, shop at a store first and do some reconnaissance research before you buy here because returning will not be pleasant. Once this thing unrolls it will be almost impossible to repack it in its original package.
Dont be afraid to buy here though. Like I said, I have bought all 3 of my topper here. I am a bargain shopper and the price is ALWAYS the best here. As long as you know what density you want and thickness, go for it....you will not be disappointed!