All contents being on cloud, Scope of extension/scalability is very high.
Creating a new site/directory is very easy and manageable. Nice access approval system to any sharepoint directory or site. Users need to request the access before using the website or owner can manage how and whom to give access when creating the site.
Syncing the sharepoint content is a nice feature. Once downloaded, do all your task from that copy. This will be automatically send updates when any changes made or the local copy auto updates after sharepoint changes by other users.
Sharing any kind of document becomes much easier.
Search is very fast across the whole website.
Ability to share with users outside the organization.