Sometime back in December I decided to switch out my stock headlights and go with the 6000k HID lights.
Being a complete novice with headlights, I was at first hesitant about switching out my headlights fearing that I would mess up.
After doing a decent amount of research and reading up forums I decided to order them from an online website. Initially I was not sure of the website's reputation, but decided to try them out. The headlights that I ordered came within a few days and the installation process itself was quite simple, other than removing the Audi A4 headlight housing which was kind of a pain. The lights themselves turned out pretty good, but last month one of the lights broke. I emailed the website and asked for a replacement, since they offer a 1 year limited warranty. Once I found out that it was the ballast that had actually broke, I emailed and requested a new one. The website responded and shipped me a new ballast within a few days and they have been working fine since then.
The website that I purchased them on was blindinghid.com if anyone wants to upgrade their lights, but don't know where to purchase them. I am not associated in any way with the website. I just decided to write a brief review in case anyone was thinking about upgrading to HID lights.