The right tool is always the question...
Hi Rand
I have not tried the program you mention... but...
My journey with GTD started with paper planner (Filofax, Personal size), via Palm (Life Balance), back to paper, then to iPhone (trying out Things and Omni Focus - OF on both Mac and iPhone)....
I´m back on paper now, no surprise ´cause I like the feel of a brand new diary at the begining of a new year, jotting down peoples birthdays and other things that I already know is going to happen in the new year... etc...
As you can see :
http://www.gtdtimes.com/2010/10/12/what-are-the-best-tools-for-gtd/#comments
there are many ways to mastering GTD with a lot of different tools...
I hope that you get the principles about GTD first, before you trying to find that "silver bullet"...
Remember this.. it´s not the tool that do the work, it´s you. The tool is just a tool to collect lists with your next actions, projects, Agendas and other contexts...
This was a long answer and it was not an answer to your question...
Hopefully you get the grip of what tool you will use.
Best whishes