DDM Tuning is a couple miles from where I work. I have a set in each of my cars and haven't had any issues. Their service isn't too awesome though lol.
I had to take the left side fender off to give me enough room to mount the ballast. I also wanted to reuse the stock dust cover so I had to make the hole for bulb a little bigger to fit. Other than that, there was nothing I had to mod, the kit plugs in to your existing headlight connector and if you get the kit with hi/lo beams, you'll just need to find a good ground.