I was skeptical of the "bed in a bag' style mattress, but I have been wonderfully surprised. The mattress inflated just as described and within 2 days I had a new bed. The full size is slightly larger than the full size box spring I already had, but it isn't a problem. The mattress is very comfortable, with just the right about of firmness. I have major back issues and it had been years since I was able to sleep more then 3-4 hours, but that is a thing of the past! Thankfully I sleep a solid 6 hours every night, without waking or experiencing additional back pain. I still can't believe how amazing the mattress is for such a low price. Thanks Wayfair for providing option to this product. I'll be ordering a queen size next month.