I love this software because it's easy of use with very intuitive interface, you can build your own workflow by dragging-dropping components or templates from library.
You can also import excel file as template which makes building complex workflows super quick! There are some minor issues like sometimes when multiple users try to open the same document at once or during system maintenance time, they will get error message "There was an issue loading documents". We're using Rethink Workflow in order to organize our daily activities more efficiently so we could have a better overview of what needs to be done next.