I thought the video at http://vimeo.com/101948793 was helpful. Lots of "fake" work like email sucks your time because it's right there in your face. Seems like this app tries to put important but not urgent goals and habits on an equal footing with urgent but not important tasks.

pg said it pretty well: "If I spent a whole day watching TV I'd feel like I was descending into perdition. But the same alarms don't go off on the days when I get nothing done, because I'm doing stuff that seems, superficially, like real work. Dealing with email, for example. You do it sitting at a desk. It's not fun. So it must be work."

If the app works well, it may be because it guides you toward the right long-term priorities instead of you getting caught up in busy work.