I've been using it for months and I find it very useful. It can be configured in detail and has many options for export and visualization. Drag and drop is fully functional, as you expect in mac programs.

Just to look for perfection, the major criticism is lack of "hypertextuality": it would be nice to click on an actor (director, writer, ...) and have an immediate filter. Of course this can be done with the search box, but you have to write it again, or copy/paste, and the search is full text, and frequently includes unwanted results. At least, a right-click search would help.