Hi faded09,
That would be a difficult question to answer because the mattresses has only been sold for less than a year.
Durability is also dependent on many factors and is relative to each person (a mattress will be less durable for heavier weights than for lighter weights for example). Post #4 here though has more information about the factors involved in durability so you can make more meaningful assessments of the durability of any mattress once you know its construction and the quality of the materials that are in it.
Phoenix