Hi shaxpere,
The links in post #63 here are working.
There will be a break in and adjustment period for any new mattress or sleeping system as the foam layers lose any of their initial “false firmness” and soften a little and the cover stretches and loses any initial stiffness and your body gets used to a sleeping surface that is different from what it is used to (see post #3 here). This would typically be a few weeks but it can be shorter or longer depending on the specifics of the person and the mattress.
Phoenix