I am an independent consultant with a bunch of clients, often more than 7 active at any one time and I have to say Id be lost without 2do.
I love it because it easily matches how I work. Its super easy to use but also very powerful. Additionally the more you scratch the surface, the more it offers.
Its fantastic (and quick to sync) across all my environments as well - iPhone, iPad and Mac.
Is it perfect - of course not! What is? For example, Id love to have the Macs key commands available on the iPad (when Im using keyboard)...but compared to how it keeps me organized its a tiny issue.
Ive tried lots of other tools, some GTD, others free or expensive. None works for me as well as 2do. That says a lot since Ive been searching for *years*.
SBerley about 2Do - Todo List, Tasks & Notes, v3.8.2