I was worried about buying this product online because I had read so many reviews about some types of memory foam being too soft, smelly, hot or just not comfortable, but this was not the case and Im glad I spent the extra money for the Gel memory foam. The 3 inch topper is perfect for me, I don't feel Im sinking too far into it (i am only 140lbs) and I think maybe the 4 inch would have been overkill and the 2 may have not been enough. I did notice the smell when I first opened the package but I let it air out for about 6 hours and I don't notice it anymore, the previous memory foam i bought from Kohls made the entire house smell for a few days. I was skeptical about the Gel addition but with my old memory foam from kohls I would notice that after sleeping in the same position for a while the part of my body touching the foam would get kind of sweaty and hot, the Gel one from OS seems to be much cooler, not like it's a cold menthol feel that doesn't get warm, but more like it just pulls the heat away better so it's not just insulating your own body heat, I feel it was worth the extra money. Overall the topper supports my entire body just right and after the first night I feel I fell asleep faster and woke up more relaxed. I really do feel like Im sleeping on an expensive mattress. Delivery was fast so I didn't have to wait long to enjoy it.