At my age I have lived with a number of mattresses and the Sleeping Duck is up there with the most comfortable we have ever had.
But it is so heavy my wife can't make it.
Just trying to fit the fitted sheet is a real task and I am fit and 185cm.
It is so heavy trying to tuck the top sheet and blanket under this mattress could do your back in.
We have a modern "Slay bed" so the mattress sits about 50mm into the bed and trying to lift this dead weight is just not worth the effort.
We have had to swap it to the spare room it is just beyond us, you don't need this heavy mattress in your life.