Intuitive, and it looks like it is organized so that - unlike Xmarks which is now a value destroying disaster that makes scrambled eggs out of my bookmarks weekly - it will actually keep things in order since there is some "intelligence" in how it tags and organizes bookmarks. Not sure yet how easy it will be to manage as my many bookmarks become part of of the Bookmark OS environment. Looks promising. THEY MUST develop versions for Chrome and IE/EDGE (and Opera) to compete.