I had the "triangle" shadows on the first batch of bulbs I've had. It had gaps in the output. After those were replaced I had an issue with fuse that is about 6" from the battery post. It shorts out and my headlights would randomly turn off going down the road. I've replaced that part but it still happens occasionally.
I don't mean to highjack this Volt thread, but I'm really happy with the two YFs I've outfitted with DDM HIDs. You get them a week after you order the kit, but they come direct from China. The quality has been there in my opinion, and the price is hard to beat unless you want to gamble on eBay.