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It feels wrong using more than one To Do app: it's actually against the ideas of Getting Things Done. That's for a good reason, too, as when you have what it calls one "trusted system," you always know when you're done. If you have two, you have to keep checking two; and good luck deciding what goes in what. Yet, that's what we're doing now, and it's because of Due 2.2. You can think of Due as a basic, but loud, To Do app. Its function is to make sure you do something when it has to be done. So if I've got a phone call to make at a certain time, I'll put it in Due instead of OmniFocus.