Mellel is not perfect: it has flaws and shortcomings, it still lacks some rather essential features, and existing features are not always perfectly implemented. And it certainly isn't the most user friendly of wordprocessors.

And yet, especially for writing long and complex documents, Mellel is absolutely invaluable: truly a class of its own. Solid as a rock, superb outlining, excellent crossreferences, very fast and very pleasant to use even with documents counting many hundreds of pages with thousands of footnotes. I have been working now with Mellel for over four years, and could not imagine my academic writing without it.

Besides Mellel, I own many other wordprocessors. I use them regularly for less demanding writing tasks, and like quite a lot of them. But if some cruel tyrant forced me to give up all my wordprocessors except one, that one would undoubtedly be Mellel.