I have arthritis in my spine and hips. With this topper I sleep through the night and wake up with very little pain.  A few years back I bought an expensive topper that was not this comfortable and the smell NEVER went away, I got rid of it and went back to cheap foam that didn't hold up for long.  With this I let it unfold and air out for two days on the floor of my spare room, put it on my bed, and I love it!  The price is reasonable. Obviously there are NO CONS.