Police would probably hate it, because having your side arm malfunction in dark alley in life and death situation is probably something you want to avoid.
Organized crime would probably love it. Manufacture of unmarked firearms is not that tricky. Fresh market for illegal goods is suddenly created, as now it's not only the criminals who want these, but also survivalists and all kinds of paranoid people. If you run the numbers of murders with illegal guns/ amount of illegal guns vs. murders with legal guns / amount legal guns, you will find that illegal firearms are roughly 10X or 20X more likely to be used in homicide.