This was our first “boxed” mattress - and to look at that little box upon arrival, you’d think “no way”.
I can not believe just how nice this mattress is.
Not just that - it completely changes the transport game.
Traditionally, when you bring a mattress home, you have to shimmy it between doors and down hallways - None of that with this!
You bring the little box to where you want the mattress to lay / pop it open and you’re done! 
It took about 2 full days after opening for the mattress to completely lay flat and evenly.
After that, it was ready to be used and it’s very comfortable. 
It was perfect for our kids bunk set - And there are no comfort complaints from them, either.