Glass or Plastic lenses: Which is better?

[JNewell]

I've been using SureFire lights for somewhere between 15-20 years and while I understand and can make the arguments for Lexan or similar materials, I don't buy them (the arguments...or the plastics). "Plastic" scratches, melts, yellows...glass is a better choice unless you have some ultra-specific need for a non-glass material.