In my 25 years of Tradeshow/Special event experience it has become apparent that a person that is truly interested in what you are offering will make their buying decision based on your personal presentation and presence.  You have only seconds to capture an attendee’s attention, so be confident and look your best. If you are compelled to have a giveaway item make it something informative with an invitation for a post-event meeting, teleconference, or your website to help differentiate you from your competitors and secure their business.