Not as good as a fully supported chamber, but hardly the deathtrap implied by Glock bashers, either. The fact that literally hundreds of thousands of .40 Glocks have been in highly successful service for well over a decade would seem to me to easily override the very miniscule chance of a ka-Boom.
It's not as if Glocks are the only guns that ever blow up. You just hear about them more because there are so many more Glocks in use than virtually anything else. And there are reasons Glocks are so popular, whether or not they are your personal preference.