It expanded nicely, we moved on from a traditional cushion top bed, which after a few years was killing our backs.   This is our first "bed in a box" experience. Lol so far it's been great.  It expanded pretty quick. Within 2 days we were sleeping on it.  We both fall asleep really quick.  It's comfy- but then in the middle of the night we wake up adjusting- our backs are transitioning.  But Business fall asleep rather quickly...Some people it takes a couple of months to have your spine and bones align from the bad old matress to the new one. We are getting a soft topper to help.  I would have given it 5 stars but we like a little more softness.  I know every "body" is different so it's not the beds fault.  Lol we love the mattress. We do need the firmness as well to help our bodies feel the best they can.  It's been around a  month and we are happy with the purchase.     Glad we purchased it.