My experience is that the learning curve is steep but the payoff is large. The Apple Cocoa/AppKit/CF libs are hefty things to get started with, but man do they

My experience is that the learning curve is steep but the payoff is large. The Apple Cocoa/AppKit/CF libs are hefty things to get started with, but man do they make some hard things easy once you get the hang of it. They also tend to push apps to behave more consistently, because people aren’t always reinventing the wheel for more complex UX.