For people who arent already committed to their calendar apps this is a great catch-all or starting point, but for those of us already established its a bit pushy and intrusive. Functionally its pretty solid, but its taking steps in the wrong direction. At a certain point its easier to move away from AbyDo altogether than integrate all calendars, etc.- especially with this BS pricing model. Monthly billing is garbage,especially for something as trivial as themes (by which they mean simple background colors).
MarioBroth about Any.do: To-Do List, Tasks, Calendar & Reminders, v4.6.0