Wait until January 31st. Omnifocus 2 is coming out
A good app to manage our tasks is very important and it can be very helpful. Omnifocus is a good tool but, personnaly, I found Beesy app whom I can manage and share my ToDo quickly, import PDF doc, follow up projects.. and is really cheaper (iPad To-Do directly from your notes - Beesy).
Omnifocus is interesting but it's better when you can have a good app more cheaper.
Sofye.