Over the years Ive purchased and used: Things, ToDo, The Hit List, plus numerous others (cross platform has always been important). I worked really hard to learn and like them all but after extended use each one of them felt annoyingly lacking. I purchased 2Do over a year ago and after initially looking it over decided that the abundance of complexity and features imposed a steep learning curve so I set it aside. After continually seeing all of the positive reviews and being fed up with Things and THL, I decided to revisit the app patiently. The developer has an abundance of video and written tutorials. Taking my time to review many of them while playing with the app I suddenly had an epiphany; this is the productivity app Ive been looking for!! Ive never experienced visceral feelings of satisfaction about any other comparable app before 2Do; I love it! Its fast and flexible (and fun); it should be a learning model for Cultured Code! It shares quite well and has nice hierarchical features and depth without overkill; both weaknesses for THL.
I didnt realize that 2Do can receive input from Siri until I dug through much of their support material. It can do this in a couple of different ways, one of which is really cool. By choosing to sync with Apples Caldav, Reminders becomes a mirror of the lists and tasks of 2Do. The Siri Reminders sync over via the Inbox. I havent seen this methodology employed in any of the productivity apps that Ive used but it is quite comprehensive. Im still working on becoming facile with 2Do, but contrary to many of its competitors, familiarity breeds admiration!
Xootrman about 2Do - Todo List, Tasks & Notes, v3.8.2