Actually I find that Commercial works great for the initial installation, but after a few years you find the directory either:
-has never been updated
-lists "Bob's office" when Bob retired 3 years ago
-"new copier" in an office with copiers all over the place.
I find that the scribbles are often more reliable than the typed/printed cards; if only because whoever put it in had a pencil handy in their pocket.
BTW, a few years ago I saw a safety switch at Midway airport that was still in use and labelled "Fred Harvey". That was pretty tricky to track down since Fred Harvey restaurants have been out of business for many years...and tenants change at the drop of a hat over there.
