The lack of this notion of Status, which a basement of the GTD method, is a key issue. 2Do is full of good ideas but without Status, I cannot use 2 Do for the time being.
I keep it on my iPad, checking what is coming in the new version.
You have implemented a notion of Action which might be used to set-up statuses but the 6 proposed values are fixed ones.
Unfortunatly, the only app that today correctly follows the GTD method is... Toodledo for iPad which offers all the features and a perfect sync with Toodledo cloud and web app (of course !). The bad point is that the design of Toodledo for iPad is not as good as 2Do or other competitors but between features and design, I prefer features.
But I keep an eye on 2Do and may be, on day, we will have a GTD compliant solution... which should enlarge the market for 2Do.