Best app for GTD

Update for iPhone 6:
This app isnt optimized for iPhone 6 yet. It works fine, but the UI needs to be scaled properly. It just doesnt look very good. I will restore my 5-star review once this has been updated.

I use this on Mac, iPad, and iPhone. It is worth the investment and time to learn how to use this effectively. You will get HUGE ROI in productivity by using OmniFocus.

Darcy S about OmniFocus 2 (legacy support edition), v2.3.1