If you search the archives, you'll find that this link has been 'discovered' about a dozen times in the past, not exactly a revelation.
It's just that a new crop of owners are finding it for the first time.
It's a good resource, but not a complete set of manuals, and alot of the info is for ROW models - it's a .uk link, so if using it be sure to check that it applies to US models as well.
