It smells unpleasantly. Memory foams are said to emit an odor that last for weeks, making new owners feel uncomfortable. Open your room’s windows once in a while, to let the memory foam breath and it will help the odor go away quickly.

Not as firm as one imagines. Some owners feel that the memory foam mattress they have tried in the stores are much more softer. Why is that so? Those mattress on display are actually already broken in. Several others have tried it. As for your new memory foam, in time, it will feel less firm.

It feels hot, it “cooks” the sleeper. Memory foams supposedly don’t do well in warmer climates, as air circulation seems to be hampered. Some companies who make memory foam have corrected this by adding a special layer that encourages air circulation better. Using cotton sheets over memory foam may also improve the situation.