Having been thru this multiple times on the tech side, but very few under warranty, i will say we tend to advise customers to use their glass coverage. No deductible typically, and everyon out here has it due to our wonderful rock decorations that make it onto the freeway. However, the ones i have had under warranty, it has been explained to the glass company, that if they break it, they are replacing it. And as long as the glass has the super duty in the top, it is replaced with factory. Had mine replaced thru insurance, and it is ford glass.