My M5 had factory HID projectors and they were excellent (auto levelling, like my Jeep has now) my Charger did not have that feature so rises/hills could potentially lead to light going where it shouldn't. I think a lot of the early factory HID setups were actually pretty good. I think the fact that HID bulbs require a bit of work to get into a reflector housing is what's kept it from being more widespread. With the availability of LED's in a format that fit in the location of a traditional halogen bulb and the cost of entry being much lower the offence rate has increased. That said, I do think that an HID in a halogen reflector typically results in a more intense glare, at least from what I've seen, than your typical aftermarket LED in the same housing.