I'm very happy with this memory foam mattress topper. At 8cm thick, it's thicker than most others (5cm). It has given new life to my tired old mattress and I'm sleeping deeper and more comfortably since using it. The price is good value compared to similar alternatives.
A word of warning though. You need to air this thing out for a week - out in fresh air - before using it. It gives off a crazy level of chemical offgassing - probably some nasty VOC's. I felt like I almost got asthma when I left it inside my house to air out the first day. Be patient and give this plenty of time to air before using.