I recently purchased and installed Ed's hid headlights for the gti mk7. Here was my experience:
For some reason, i thought when you ordered the headlight with the HID kit, that the kit would come pre-installed and packed into the headlight in a tight package (ballast and all). But that wasn't the case. I had to install the ballast separately and figure out where to mount the ballast. No matter ... i probably misunderstood.
I opted to take the front bumper completely off to make the install easier. I would recommend to definitely have another set of hands to help you take the bumper off and re-install. I had my wife help me out.
The passenger side headlight went in smoothly - no issues. Fitment was perfect.
The driver side headlight was another story... for whatever reason, the headlight didn't fit perfectly There was some gaps and alignment issues, so it took a great deal of effort to get this side in. It still doesn't fit as well as the passenger side. The other thing that was really difficult was that on the driver side, there just is no room.
After getting everything installed - the lights work well enough, but I am noticing that there is are rotational errors to the beam pattern ... on both headlights. I can tell b/c the beam is not perfectly straight, but it bows on either end and there is a foreground to the beam pattern. I did some searching and looking at the pics of other folks who installed Ed's headlight and noticed the same thing in their photos. Wondering if anyone else noticed this or if I'm just the unlucky on...