I've bought a pair of HIDs from ebay and another 2 pairs from the local ghetto audio install store and never had any issues. It actually doesn't surprise me that American Muscle is asking $300 for something that costs $30. And yes, if you get the right kit, it should be plug and play. Keep in mind the light will be scattered like crazy if you don't have the correct housing like Cpotts said.
I've also never really been a fan of LEDs used as the primary source of lighting. They're good for driving/road lights but if you're not running them on a truck, they do seem to fall short.
I've also never really been a fan of LEDs used as the primary source of lighting. They're good for driving/road lights but if you're not running them on a truck, they do seem to fall short.