Mousepads and screensavers are moving up fast. So is free information. If you ever plan to lure prospects with a freebie, be certain to research that freebie first. Guerrillas not only research their market, their competition and their promotions, they also research the best premiums for their specific target audiences. They know problems arise when bribes aren't matched with the audience.
Problems also arise if the freebie breaks or wears out in a hurry.
They won't see my face anymore. About the only disadvantage is the teeny-tiny space available to say anything to the recipient. There's usually room for your name, possibly your theme line and logo, but that's it. That's not even counting the high response. And the goodwill.