Seems like my comments aren't popular with Focal fans... Hey, it's their money.

As for why I used Sennheiser and not Beyer, it's because Beyers are already known for good build quality and repairability, while Sennheiser's plasticky-ness are often seen as a con, but still does not affect their durability. I use Sennheiser as an example of good plastic use, unlike Focal.