I bought this Restonic Monarch mattress at a cost of $1170 barely over four years ago, and it was noticeably sagging by last year. My back's been hurting for over eight months now, and has to do with the bed being so uncomfortable.
It will be picked up for repairs by the furniture company that sold it to me on Tuesday, but I was not offered any other form of redress/correction, when I would have preferred to have been given a pro-rated refund on the bed so that I could buy another brand.
I wouldn't be at all surprised if the repaired mattress shows the same sagging in the center where I sleep [alone] within or before the same timeframe.
I may have to put this mattress in a bedroom where it won't be much used, and go back to my 33 year old Beautyrest that still has no sag to it.
I'd not recommend this mattress to anyone.
Review about: Restonic Mattresses Bed.
Monetary Loss: $1169.