Our Natura Tranquil was shipped from the factory in Canada to the dealer, and it was delivered about one month after it was ordered. It was used on a platform bed in accordance with instructions from Fells Point Futon (Maryland), the dealer from which it was purchased. The mattress was quite comfortable for approximately six weeks, and then my wife and I began to notice back and hip discomfort in the morning. We examined the mattress and found that the foam in the areas that supported our bodies had lost its ability to rebound, leading to sagging under our weight (we are both average size and weight). I should mention that we rotated the mattress every week (it is only finished on one side). We also noticed that the stitching in the edge binding had started come loose.
We contacted both the dealer and Natura, and received no satisfaction from either. The dealer refused to return our calls for more than a month, and Natura made demands for extensive but irrelevant documentation even before considering the possibility of replacement. Furthermore, the warranty offers the consumer no real protection (our fault for not reading the fine print before laying out $1300!).
Bottom line - this mattress became useless in less than two months. It was without a doubt a big $1300 mistake, and there's no way I could ever recommend the product.