It is as good as it says - it is a mattress topper - good quality memory foam - totally resets as soon as you remove weight. We now used it for 2 month and there is no sign of it compressing. Softens up a hardish bed but will of course not fix a very hard bed - for that you may need two of these. I find the product very good, it does not slip, id does stay cool. On our quite hard mattress ONE extra cm in depth probably would have made all the difference - but as it is we are very happy and can now keep that mattress. No way do you roll together in the middle unless the mattress underneath has a major problem !! So don't blame to topper.