I've only had the matress about a week. And so far i have had half of the nights where i wake up feeling great and the other half with a stiff back or neck. So the jury is still out on whether my body is just getting used to a new sleep surface or if there is something else causing issues. Time will tell.
We like a firm mattress and T&N fit the bill. When ones of us rolls over the other can’t feel any movement. The mattress sleeps cool which is really nice. It was far more affordable than conventional mattresses.