We just purchased this, so I will come back and review.  However, we had another mattress that we ordered from here 10 years ago.  It was killing my back to sleep on the old mattress.  This just arrived yesterday.  We unboxed it and let it shape.  While I think the full time to get it's shape is 48 hours we have no where else to sleep, so we slept on it.  It honestly felt like a hotel bed and is completely opposite of what we were sleeping on.  I have issue with back and hip pain and last night I actually had some relief.  I didn't give a full 5 stars yet because like I said, we only slept on it for one night, but it was literally like sleeping on a nice hotel bed.  Will come back and update with pics and further information in a month.