I have 12 glass carboys (love Craigslist) and one better bottle. I never use the better bottle. The first time I picked it up, I guess I accidentially squeezed it. And then when I set it down, all of the sanitizer in the airlock sucked into the carboy.
I'm super-over careful with the glass ones becuase they can certainly become a danger, but I feel they are superior when handled correctly.