The ads' cleverly implied "Which guy would you rather be?" message and visceral punch have created love-'em/hate 'em camps, probably roughly split between people who consider themselves innovators versus those struggling to keep up with new technology. In other words, precisely the dynamic that Apple--renowned for keeping its marketing strategies as close to the vest as its product plans--presumably had in mind. The instantly iconic campaign quickly spawned satiric takeoffs ("The Lost Mac Ads") on VH1.
At one time, I was a cool mac guy. A long long time ago in college I owned an Apple MacIntosh SE. No hard drive. But I loved it.