It's great that our clients can access their online presence from anywhere in the world, at any time! I've heard some complaints about it slowing down when you have many users logged into your site simultaneously but this hasn't been an issue with us thus far since we only use one computer to manage everything (which is connected directly through ethernet cable).
We also like how easy it is to set up new pages or products using drag & drop functionality. If they ever do add more features then I'd love if there were ways to automate them so my workload would decrease as well. The best part by far has been being able to create websites without having much technical knowledge required.