I loaded the new OS late last night it was close to midnight when it was completed. It took about 40 minutes to install and that was after about another 30 minutes to download the huge files and read thru the directions on "how to" install. I haven't had any time to explore every new feature but what a nice upgrade. I already started doing some tweaking i.e. loading back my Songbook, changing style locations of the new styles since some of my own favorite styles got overwritten with the upgrade. Overall it was a very smooth non-problematic upgrade. The key is to carefully follow the directions in the pdf file and SAVE SAVE SAVE your configuration.