Generally, not to the person you're giving them to. However, they are pretty effective advertising for things like coffee cups, laptop bags -- items that are l

Generally, not to the person you're giving them to. However, they are pretty effective advertising for things like coffee cups, laptop bags -- items that are likely to be used on a daily or semi-daily basis, and that are large enough for people to see and wonder "Okay, just who exactly IS <your_company_name>?!?" The big catch with that of course is that most people already have a coffee mug or laptop bag, and aren't likely to switch to yours, so, while they'll gladly take them from you at your booth, they'll probably end up in a closet.