The ability to have control over many aspects with one tool, like shipping costs for example! Also able to make changes in real time when you're working live online or offline. I wish there was an easier way to keep track of my inventory but it's not too bad either since we can use other tools as well (like Xero). It works really great if your business has more than just 1 store front/website though because then everything becomes very confusing at times - especially keeping up with different accounts & stores all together. But once again this isn't terrible nor does anyone else complain about its features so maybe they've improved upon them? We are using Data Source mainly for our accounting system which helps us sync across several locations easily without having separate software installed everywhere!