DDM kits ARE china kits! They get shipped directly from China!
Here's my experience with DDM:
many of my friends installed their HID Kits on their cars maybe 3-4 years ago and raved about how great they were at the price. So when it came time for me to get some, I got the DDM kits.
Upon arrival, my friends all mentioned how the quality of the product was nowhere near what they had in their cars. Their DDM kits were still running strong after all these years and the ones I got, the lights would hardly stay on, resulting in what seemed like broken headlights, when in reality, it was just a shitty ballast.
After a couple months, I threw out the DDMs and bought the Volt Kits, havent had a problem with those at all. Highly recommend spending a bit more so you don't have to keep trying to "fix" the shitty ballast just so your headlights will stay on.
So yes, I do think the DDMs are good for the price, but you get what you pay for. It seems that when they first started out, they shipped out higher quality goods to draw buyers in and build a reputation and over time, their quality when down once they got their name out there, so now they're attempting to sell the name rather than a good product. I'd suggest to stay away!