Line skis are good durability but as others have said you get what you pay for.
Also I think these threads give a very skewed idea of what durability you will get from a ski.
You could make a thread with any ski brand like this, "How Durable are Armada/Nordica/Atomic/Salomon/etc" and you will always get a bunch of people coming and telling you their horror stories about how they got 18 edge cracks in a month or how their skis snapped in half etc, etc.
This is because people who are disappointed or unhappy with the product are much more likely to complain and spread their negative experiences, I don't know why, maybe it's because they feel the need to get back in a way at the company. People who are happy with the product generally tend to stay quite and just enjoy it and so they're much less likely to come and endorse something.
So because of this I think you should take what you see here with a grain of salt. The best way to decide on skis is to go demo them.