, if correctly configured,
Indeed. Those words were put there with purpose. Not simply for padding.
I have seen the effects of people implementing overly aggressive anti-spam configurations.
You have to spend a couple of months monitoring the system and tweaking it for your own purposes... you can't just copy paste configurations you've found on the internet. Which is where most people go wrong and are then surprised when they get a whole load of false positives which is only down to their own stupidity.
However, once correctly tweaked during the initial setup, it runs very well indeed. As I said, I use it and I know many other companies around the world who use it (and with whom I have absolutely no relationship, I just know they use the same setup), and I trust it sufficiently that I don't operate the quarantine functionality.