Pros: So far they're amazing. Good build quality and they're super bright. No warm-up or start-up lag like HID. Just plug in and get started. Cons: The back of the case is quite large. So if you don't have a lot of space behind the factory lamp, some modifications are probably needed. With the 04 Sierra, the bodywork on the driver's side has to be cut out of plastic. The supplied O-ring is too small for the factory bore. I had to use the ones from the factory bulb so they fit exactly. An installation problem is not the fault of the manufacturer. It's only an issue for some LED conversions and something to look out for when buying one. Customer Service: I called the manufacturer and they weren't very helpful. The lady I spoke to seemed to know little about it or what needed changing. She offered to return them, but that wasn't the point. I can't talk about the return process as I kept them, but there is also something to consider. Overall happy with them now that they are installed. Very bright and even light distribution. Easy installation after changes. I recommend if it is convenient for you and you can solve the problem.
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