GTD Sync Reviews

I've been using GTD Sync on and off for years now, and I always return to it after trying other task management systems because it's really the most visually accessible, elegant and portable system I've found that implements GTD in a way that gives me the top-mid-and ground-level GTD overviews of projects and tasks that I can reorganize easily, without necessarily feeling overwhelming or impossible (hide child nodes!) - I'm so grateful to @haaihenkie for working on this - it's really helped me a lot over the years.