I waited a good few months before leaving this review. It was at full size within a minute of opening the seal and it did not need any more time beyond that to fully expand. It’s definitely heavy, so moving it around is way easier with at least two able-bodied people. It was comfortable from the start, but has definitely gotten even MORE comfortable over the last few months. No sagging, no noise, and great back support. We haven’t had any back issues ever since. It is definitely on the softer side than it is firm, so be aware of that, however we have it on a solid wood platform bed frame with no box spring so we may try getting a firm mattress topper out of curiosity. I’m way heavier set than my partner and he hardly feels me moving around. Absolutely recommend either way, especially for the price!