I've been using texmacs for a little over year now, and have loved it. For me, the nicest part is much simpler creation and editing of tables and aligned math. I also appreciate the image insertion; in LaTeX my images often end up not quite where I want them (I know, you can specify "here" for your images, but I'd prefer if they were just "there" to start with). Of course, depending on your use case, your mileage may vary.