I can see where Neil is coming from with regards to the strenght of the boxes. As he rightfully said they won't take that much of a hammering! But concidering that Neil managed to get 18 months out of them doing the amount of fairs etc that he does I think mine should be good for at least the next 10 years or so !
Thats why I use the leather cases I have two types some hold 96 pens and the others 48 pens including the click sierra