Hi Flerpi,
Welcome to the Mattress Forum!
Congratulations on your new mattress! As you know Addable is a member here, which means that I think highly of them, and you certainly made a good quality/value choice.
Thank you for your photos of the unboxing. Some odor with a mattress like this can be normal, and hopefully much of it has dissipated for you already.
I still felt like it didn’t give quite as much as I’d like to my tail bone though, and when I woke up in the morning my lower back still hurt, but to a lesser degree than with my old mattress.
There will be a break in and adjustment period for any new mattress or sleeping system as the mattress loses any of its “false firmness” and the cover stretches and loosens a little 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.
Having slept on your mattress for one night of course isn’t enough time for you to make a judgment on the product, but it seems that you are moving in the right direction, and you had the foresight to purchase something that allows for a long trial period and refund in case things don’t turn out as well as you had hoped.
I look forward to your updates.
Phoenix