The Xtralights HID Xenon headlights are the best auto headlamps I've ever used. They are as bright as you're going to get without upgrading to high-intensity lights. My primary concern, is the life of the product. My first set lasted for few months, and I don't have day running lights and I assume I use them as any other average/reasonable driver. It didn't even last long for 6 months, they really disappointed me with the product.
But their customer service was excellent and sent me a new set immediately after my complaint. Those were pretty good, but also again not sure about the life of the product. But after that...I'm not sure if I want to spend more on their products or not.