For set up, everything went very well with our new mattress. We let it sit out for 48 hrs before use. My husband and I have been searching for a true medium mattress, not too plush but not too firm. Unfortunately, this mattress is way too firm for us. If that is what you seek, you will love it. We already have a mattress topper so we decided to use that, which helps so much, so we decided to keep the mattress. Maybe over time it will become less firm