'Tested' one of these in John Lewis yesterday. It seemed suitable altough im concerned it will be too hot in the warmer months( had issues with a memory foam topper before) , so for that reason i wont be ordering for a few months so the 100 day return covers the summer.
I did notice when compared to other mattresses in store it was on the cheaper end of them all, suprising considering its so 'advanced' and the no quibble return option. Made me consider how they would last over the years...