We got the gel memory foam mattress topper and are very happy with it. I read in some other reviews that it smelled like plastic but in the instructions it says to air it out for a few days. We left ours in a room with the window open for about 4 days and haven't had any problems with it smelling like plastic, but we definitely smelled it when we opened it. It is pretty thick which I am happy about but if you put a lot of focused weight in one area (For example if you put your knee down or stand on it) it sinks a lot which I'm trying to get used to. Aside from that I think it has made our bed much more comfortable.