In reply to simes303:
My friends said similar when I bought my Phantom 6000s... 'how much???' I just considered it 60 euros per toe insurance.
I spent probably 90-100 euros on my julbo explorer 2-4 cat glasses and don't regret it. They fit me better than anything else (was actually planning for a cheaper pair but they all had big gaps to my apparently awkward face), and I'm not sure i totally trust 30 euro glasses to be genuinely cat 4. Plus, the Julbo photochromic can't be scratched off, unlike the coating on my old glacier glasses.
So, would I spend 50 euros per eye for insurance to keep them from getting knackered at high altitude? Totally! I like my eyes and only have two
Feel free to examine my head. Haha