Absolutely love it. It fits the bed king size perfectly and you don't have to worry about the sheets fitting, they fit perfectly.  My back and hip do not hurt anymore when I wake up and it saved me not spending thousands of dollars on a new mattress just yet. It unfolded fine and it did have a smell to it but I had it on the spare bed and had the window open all day to air it out and by the next day it didn't smell hardly and I sprayed with some Lysol and was able to sleep on it the next night.  Its cool & you don't sweat either, which is a plus.  I would highly recommend.