I saved almost 400 buying mattress online from Wayfair plus delivery issues.  The box was heavy.  It took several minutes to open mattress from plastic and it was hissing for about 3 minutes. I placed it on my platform and within 24 hours it has fully expanded to size.  It is comfortable.  It is higher than what I needed but I feel it gives me that “sleeping in the clouds” vibe.  Great transaction.  I received package sooner than stated online.