I am currently using Things 3 along the lines Cultured Code intended, with a few extra wrinkles thrown in. While I view my usage as broadly compatible with GTD, it is not a simple transcription of a paper system. So far, it is proving extremely successful. My mind is so much like water, my wife is complaining about the puddles on the floor.
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
So far, so good, but I’m giving it a bit more time before I describe it here.