[CatOne]

While the Things UI is initially quite "pretty," the usability of the program as a whole suffers.

It is a very "clicky" interface, and you need to use the mouse pretty much constantly. After using it for a few weeks, I was just "moused out." It's much easier in OF to get stuff done with the keyboard. In general while OF isn't as "sexy" out of the box, it is possible to get it operate much as you want -- including defining contexts as Today, Someday, Next, etc., if that's your preference. You just can't have multiple contexts (er, "tags") on a particular task :-)

Very frustrating about things is the inability to see all tasks at once. You can use Areas to give visibility to things in Next, Scheduled, and Someday, and maybe subdivide the areas up by sorting based on tags, but there's really a lot you need to do there as well.