I wasn't sold on HID until the first time I rode in an IS300 at night. Wow.....I've had a bone for them since.
I've only had 1 bad HID experience on the road, and that was driving in front of an X5 on the interstate for a loooong ways. They were very bright and aimed too high. If they weren't aimed high they would have been fine. Also if that jackass didn't insist on pacing me for 50 miles they wouldn't have really bothered me either.
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