The ease to create unique layouts with minimal effort! We have been able for our clients' designs that are more visually pleasing than previous solutions offered from other companies which were very time consuming (and did not always turn out as expected). I would like an option where you could see your final layout before sending it off so we can make sure everything looks good together without having issues later down the road once they receive their product - this process has become much faster since implementing Spreadsheets into each new project's workflow plan/approval processes.