I've fired three of them, ranging from brand new to used hard. I have never heard from their owners of any failures, or experienced any for myself.
The nice thing is that it is cheap, relatively speaking. So if it turns out to be a dud, you aren't out all that much. Put it through the wringer and see how it holds up. If it fails, get it worked on. Once you are confident in it, keep it next to your bed.
The two enemies of the people are criminals and government, so let us tie the second down with the chains of the Constitution so the second will not become the legalized version of the first. - Thomas Jefferson