3 stars: It is very basic. It does sync my files stored in the cloud across devices. The search does not find everything. The view options that are common in windows are not here (android). The developers should spend time on a small screen with slow network speed for a month as the only way to find files and maybe they will get a clue.
2 stars: It sort of does what it's supposed to, but at the same time it's not exactly working right. I currently have the app set to only use WiFi, but strangely enough it's been using my mobile data to back up my files. In the last 15 hours it's used 4gb of data. Kind of remarkable given it's not supposed to touch mobile data. Be careful if you use this app. Sketchy as hell.
2 stars: The Windows app is the best experience I've ever had with cloud storage. This mobile app leaves a lot to be desired though... Worst PDF viewer I have ever used, and the photos feature is practically useless unless all you care about is having a backup.
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