Can someone explain to me why apps like Omnifocus & Things are worth the money now that Apple has iCloud and Calendar, Reminders, & Notes on iPhone/iPad/Mac for free? I've seen all the reviews and watch the videos about the other apps. I understand they are more powerful, but you're looking at $80-$90 for all apps combined for a given service. If you do use one of these do you just not use any of the Apple apps? I mean Siri only integrates with the Apple ones right? Would you say it's really worth it?