The instructions were detailed and made perfect sense once all the part nomenclature was understood. The included technical bulletin was extremely valuable in understanding the operation of the safety features so it was worth it to get the OEM part instead of a generic part. Only problem after installation was that the igniter did not produce a spark so the pilot could not be lit. Had to uninstall and bend the igniter tip closer to the pilot outlet until a reliable spark could be produced. After that, it all worked great.