They sell these "Memory Foam" mattresses and covers etc by stating that they were developed for the astronauts to go into space. I have always wondered about why an astronaut would need one when in space they are supposedley wieghtless. I have always therefore come to the conclusion that they are very gimmicky and have shyed away from being tricked into buying something that may not be all it's cracked up to be.
My reason for looking into it though is my bone structure in general is bad aged 28 the bed cost �500 alone just and couple of years ago, I think it might be just too firm for me especially as I have lost weight recently and I am big boned I find the hips etc hurt alot because they stick into the mattress alot, at �500 notes I cannot see me being able to get a better bed so I thought the topper might cushon my sticky out bones??
My new bed was also too hard and forever gave me backache. I bought a king size topper and have had minimal pain by comparison so I would recommend them. However I did have to buy bigger sheets and couldn't find any fitted so I chose the largest I could find and they do tuck in well. This helps as they do tend to creep slightly. Good luck!