My wife and I bought our King size Kingsdown almost two years ago.  The first year was wonderful, very comfortable.  About 18 months after purchase, body impressions began to form along with a 'hump' in the middle.  The 'hump' is the only comfort spot left.  I feel horrible in the morning, my back hurts and hips ache.  Kingsdown claim is they guarantee their product BUT they have a very very stringent policy, to the point of ridiculous.  If any of the warranty bullets are compromised, the warranty is void.  For example, if you move, make sure you do not get on speck of dirt/stain on it...warranty...