Quoted from TheLaw:
Quite often. Tempered glass when installed is super tough. AS I've said before I've only every seen 1 glass shatter from hitting it or the lockdown bar.
My GB Pro must be slightly off being square (not a level issue) the glass literally takes me both hands like Spiderman applying tons of down force to be able to remove the glass. Once I get it slid down a bit its okay, but literally it's so tight it's scary. I was an auto glass installer for years so I'm familiar with the strength of tempered and it still had me uneasy at first.