This mattress is great! I spent many hours doing my mattress research and reading reviews. I was a bit nervous when I ordered this mattress because some people stated that it didn't expand to its full size. In my case, the mattress expended to full 10 inches in only 5 minutes!!! It was awesome to watch the process of magic expansion! However, I decided to wait for 24 hours as advised by the manufacturer. It is firm yet very comfortable and temperature sensitive. I highly recommend LUCID mattress. Great price for quality, comfort and restful sleep.