I've just completed a pair of very complex piano scores with MuseScore 2.0 that I have been unable to engrave satisfactorily with any other WYSIWYG music notation software. The results are beautiful. A huge thanks to the MuseScore team for making it possible.
I won't pretend it wasn't a lot of work. Scores of this nature demand an unholy amount of manual tweaking. That MuseScore could meet my every requirement speaks well for the foresight and careful coding that has gone into the program.
I've written a blog review of my experiences creating these scores (//missives-from-the-edge.blogspot.ca/2015/06/musescore-20-great-success.html ). It looks at various challenges I faced, and assesses how effectively MuseScore dealt with operations I had to perform repeatedly. A few were maddeningly time-consuming, and could, I believe, be improved for the benefit of everyone, not just composers who write difficult or unconventional scores. Most, however, receive top marks. As time permits, I'll file Feature Requests one-by-one based on the items in the article.
The blog contains links to both PDF versions of the scores and their counterparts (with playback) on YouTube.