The updater is adequate to ensure compatible drivers are installed but I wouldn't rely on it to provide you with the latest and greatest. Even the ASUS website doesn't provide the latest because it will always be at least a step behind OEM drivers (since ASUS would have to do its own testing before republishing them). Often there are multiple generations newer and especially on older products that may not receive as much testing for new releases.
The moral of the story is if you want the latest drivers then you really have to check the OEM website.
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