Having been using the topper for two months now I can safely say I have tested it thoroughly. When first placing it on our mattress it felt incredibly soft and supportive. It had quite a strong odour for the first week or two which was highly noticeable when walking into the bedroom. The initial issue my wife and I experienced was fairly significant night sweats. In spite of the time of year (Jan/Feb) we switched over to our Summer duvet which has helped. Following this though, and perhaps most frustrating of all is the fact that with the topper on (and I've tested the bed without the topper for 2 weeks) I inexplicably wake up in the middle of the night and find it very difficult to get back to sleep. I then spend the day yawning and feeling tired. Sadly I've had to store the topper away leaving me circa £140 out of pocket. It's such a shame because it's clearly a very well made premium product but sadly its just not for me.