Purchased the mattress two weeks ago.  The mattress did not come with any documentation other than the tag on it and the QR code card.  Wish Kingsdown would include actual paperwork with the mattress showing the warranty and who to contact if there are issues.  Web sites come and go over time.  I keep all of my warranty info in a file.  Mattress seems to be well made and was manufactured only about a week before my furniture dealer had it delivered.  Mattress may be a bit too firm for me though.  Also, the edges slope down about 1-2" from the top and bottom, causing my feet to hang in mid are while my legs are resting on the mattress top. My pillow also tilts down between the top of the mattress and the headboard for the same reason.  I am right at 6' tall.   My old mattress was straight to the very edges and I did not experience this.