Clay Paky Mythos worth it?

I found some Clay Paky Mythos 1 for a realy good Price used. Like 500€ per piece. These come from a reseller, wich gives a 48h Return policy.

This fixture at the pricepoint would be Perfect for my needs. Is there anything wrong with the mythos 1, that I should be aware of? Besides beeing used. I heard something about lamp Problems, but is that realy true?

I would highly apreciate you insight on this fixture.