The most common response (or at least gentle complaint) I've gotten was, "Why did you leave out...?" From DECUS (one of the oldest groups) to Melbourne PC User Group (one of the largest), people have been sad that their favorite wasn't included.
But the story isn't about the groups' size or age. It was about the experience and what they meant. The whole point is that these were worldwide, in tiny towns (like my own Deer Isle Maine) and in huge cities.