GTD workflowy freemium

I am trying WorkFlowy at workflowy.com as another freemium alternative to Trello and Wunderlist.  If has more features than the latter but fewer than the former.

So far I am very impressed.  And yes, it does have @ and # tags for tagging items.  Just type. Place cursor and type. So easy I have to remind myself not to look for HOW, but just to Do it !