I am not a Serpa fan, but it isn't fair to bash them without an extremely thorough explanation. The military issues them, people here use them in droves, and I have never heard of the modern ones jamming, ever, aside from non specific complaints, like that video which has lots of bitching and no details.
I will continue to recommend them to people who want decent security at a cheap price, because no one at this point has presented substantiated evidence that they have any problems.
Don't get me wrong, if that video wasn't staged, I'll be the first to jump on the bandwagon and help discourage Serpa's. But first I would need detailed descriptions, and at least pictures but preferably video evidence of exactly what the problem is. Short of that, it amounts to nothing more than unsubstantiated garbage. No offense intended to mcintosh or anyone else, but please show the evidence if you want to be taken seriously.