Took over a week to fully expand but was ok to sleep on after 48 hours... its a little softer on the firm side of the mattress  but not as bad as others...  I sink in as a bigger guy but so far I've been sleeping like a baby... Its like a giant hug.  I've only had it for a few weeks but for the price as long as it lasts a couple of years I'll be very happy.   So far I would definitely recommend this mattress to anyone.... especially big people