I posted a follow up on Benzsport about the HID install and the tricks necessary to get them to work correctly in Euro reflector housings. I have spent quite a bit of time tweaking mine and they don't blind people. The HID's overload the OE reflectors, so its necessary to restrict some of the reflector, similar to this
By utilizing a small reflector in the bottom portion of the headlight reflector, you cut down the majority of light that is reflected up into the sky (and on coming drivers eyes). This will also allow you to aim your headlights up more, thus projecting light further down the road.