Clearly, such a time will go to anyone passing without a trace. Thus, the sliding feet are no longer available for years. In its place glued Teflon tape (the gamers for countless times higher price than 'Mouseskatez' sold). The Seitengummierung was eventually sticky and has dissolved, so I had to remove them completely. The underlying matte plastic is meanwhile again become smooth and shiny. Now slowly goes from the color of the left mouse button.
But all these are just optical flaws that do not detract from the function.
I had already tested as many other mice in hand, I think to myself every year, that they will eventually give up your mind and I need replacement. Unfortunately (or should I say fortunately ?!) I have not yet found another model that so well in the hand as the Dual Optical.
Also, I can not imagine the Logitech still builds such durable mice, otherwise you would probably already bankrupt, eventually everyone would have to do is buy a mouse in his life.
In this sense: the next 10 years!