I was doubtful at first that this product, tho costly, would actually work. To my surprise, it not only works, but works wonderfully! Our king size mattress (pillow top) set is only two years old but has sinking spots where we lay. This product has eliminated the dips, plus increased the comfort ofthe bed. My wife suffers from back pain every day, but the mattress topper has totally eliminated that problem. I do find it harder to "roll over" (age 63)in bed (because you tend to form fit to the topper), but I sleep much better and feel more rested then before. Did I think the product expensive: yes. Would I buy one again: DEFINITELY!! Is it worth the expense: It's priceless for us. It does add 3 inches to the bed height, so you may have a problem "climbing" into bed. but a little old fashion "foot stool" takes care of that. Well worth the cost after the first few days of adjusting to it. Other have complained of the initial smell....we had none! We just opened the box, unrolled it onto the bed, (we left the packing cover on it)fitted the top sheet and made the bed....the rest is history. We love it, love it, love it!!!! Spend the money on yourself, you won't be disappointed.