The foreigner is ALWAYS wrong.
No legal system that protect the infidels.
You risk having your salary outstanding for months at end in the hope that you will resign and forfeit your dues. There are stories from NAS in this forum that you can look up that will make your neck hair rise. There are many more, but do your research.
If it hits the fan, as it did with me in 2003, you WILL be a target. I was pretty much 1-2 minutes from tasting the lead when I turned around upon hearing the shooting in Khobar.
However, most reputable companies are OK and they treat you well.
Never forget that the sponsorship system means that you ARE someones property an can be treated as such.