"Jeez, this probably won't fit into my new camera bag!"
Photo fairs are great.
It's so easy to test a lens or camera which your local supplier hasn't had in stock for, well, probably ever.
Putting in your own memory card, shooting with D3 + 14-24mm and examining the picture back home is much better than reading a bunch of magazine tests, where on a next page there's a big ad of the product just reviewed.
If something's unclear, or you like additional information, the staff at the booth can help. Regardless the fact that in this case they did not speak a lot of English.