I spent the last two months sleeping on my brothers Expensive Memory Foam Mattress while my room was under construction. After two weeks of getting used to, I found that I slept really well. No pain or restlessness. When I finally moved back into my bedroom I decided to purchase the 4" rather than the a full mattress. I turned my 10 year old matress into a brand new mattress with this topper! It felt just like the name brand mattress my brother purchased. This memory topper is awesome. It unfolded immediately. I let it air out for 24 hours. It still has a smell but it becomes less noticable. If you have never slept on a memory foam mattress you will have to get used to it. You will notice a difference in how you feel when you wake up in the morning.