Are you looking for a deep feature set and the ability to manage complex tasks or projects? You should probably head on over to OmniFocus.
Are you looking for an app who strong point is clarity and efficiency for handling to dos? Ive tried a lot of them including some that cost more, and some that could "do more".
I keep coming back to BusyToDo because it helps me get my to dos done in the fastest, clearest, most effective manner possible.
jsterling about BusyToDo