This 1994 article by Chris Oakes, reviewing the the PowerBook 500's, is originally from Creative Mac. Unfortunately it's no longer available on the ComputerUser.com site. However, due to the miracle of the digital age, we dug it up via The Wayback Machine at Archive.org! Gotta love that!
"Don a cape and grab a PowerBook 520c - we're headed for the MacBat cave. No I.D. needed - with the PowerBook 500 series' curvy design, two-tone finish and Batmobile-style flair, the Bat guy will just think you're one of the staff."
The PowerBook 500s - Pretty and Pricey