flashlightlens for my Streamlight SL20 LED

[MidKnight]

Hi guys

Thinking about getting one of the Borofloat glass lens to replace the Polycarbonate lens from my SL20 LED from flashlightlens.com and wondering if it would be any better than the poly?

Also how strong are these glass lens,can they handle some punishment?

 

[MidKnight]

surely someone has comments on these glass windows?