I purchased this application in 2008, used it for some time and was happy with it.
And then I wanted 'something different'; not because I didn't like Easytask anymore, but just for love of change. I tried a host of other similar applications, many of them more expensive than ET, and even purchased some of them (OmniFocus, Contactizer Pro, Pagico, Taskpaper). But every time after some months or so I came back to ET, and forgot about the others.
And now I have finally understood that ET is simply the GTD application that suits me best. It's stable, it has a very clear interface and a nice set of features, and it's very easy to use, . Does one need more? Others do perhaps, but personally I don't.

I'll try Pagesmith out as soon as it will have (foot)notes.