Former lawyer here. iPads make much more sense for senior partners than for associates or junior partners. They're reviewing documents and writing emails, not composing long memos or doing intensive legal research on the web. The battery life and "boot time" differential are great for senior folks who don't need a desktop environment.

I don't think this dichotomy maps onto technical roles, since there are more technical things you can't do on an iPad, but it's worth recognizing how much iPads can be a game-changer for some of the most senior people in organizations.