Hi themusgrat,
You’re certainly correct that all new mattresses will go through an initial break in period and there will also be an adjustment period that is part of sleeping on a new sleeping surface that is different from what you are used to (see point 4 in post #2 here).
It’s also a good idea to rotate the mattress more frequently at the beginning so that the initial foam softening can happen more evenly (see post #2 here)
I’m looking forward to your feedback once you’ve slept on the mattress for a while.
Phoenix