I read the reviews about the corners of the mattress not fully expanding and was a little bit nervous. upon opening the mattress it did expand quite quickly. for reference, i received it at 200pm and it was ready for sleeping by 900pm. I did notice the issue with the corners, but i removed the top cover the mattress came in and kinda fluffed out the edges and that seemed to do the trick. the mattress is quite hard upon initially sleeping on it, but after a few nights it did become softer. i really love this mattress, especially since this is the first mattress i’ve ever purchased (my old one was 25 years old lol). 55 and i would definitely repurchase