Interesting. Good to see progress on something that improves the native WP page management. Personally I've been a long time user of the Nested Pages plugin. I prefer it to the above as it works right in your "Pages" menu, so it feels pretty natural.

Either way, both these plugins to me raise the question of when the WP Core team will focus on finally updating the WP admin? In my opinion it's long overdue. Whenever I've worked in other CMS admins (ex: GravCMS) it's a breath of fresh air because it feels a generational leap forward in visual appearance.