I would say this topper has already served its purchase and we've only had it one month. Have never liked my mattress and after sleeping on a friends mattress topper I decided to give it a try. It has made my mattress "sleepable". I not longer wake up sore all over! This was a 4" weight foam. I think I would try a little heavier, if there is such a thing, the next time around. ; There was no smell or foam odor; we slept on it almost as soon as we made the bed with it on top. Got deeper pocket sheets to accommodate it. Sometimes i feel I've already created a permanent butt indent, but I still sleep comfortably!