I have over 650 pages on my wordpress site and have tried other plugins but this was the most stable to use. With other plugins, every time added a new page, the existing pages kept reordering themselves, and coming out of the hierarchy which was really annoying and took me hours to fix. This plugin is also fast, responsive and easy to use and seems to handle large page numbers with ease (some others are slow and show the expanded view every time you open the tree view). Reordering pages with this plugin is sometimes a bit temperamental (which I sort of expect with a large site), but nothing like what was happening with others. Thanks!