I am noticing that even OEM HID systems can throw a lot of glare. Even if they are aimed well and don't have stray beams when they go over a dip or bump it appears almost as if the high beams flash - know what I mean?
Then, the tall pickups and their headlights end up shining right into my back window so low or high beams are way too bright. Of course, the bigger the pickup, the closer they are "allowed" to get to your back bumper...