My initial impression after using for 3 weeks is that is is a solid concept, but not at all ready for prime time.

 These are the issues I have encountered:

1. Frequently stuck on "loading" or "deleting" or other then given message "cannot connect to server"

2. Files always default to listing by date modified, very annoying to always have to manually select sort by name.

3. Cannot download multiple files

4. Not integrated with other microsoft products - esp. publisher

5. No indication of how much space is used overall or per workspace.

6. File space available is way to low.

7. When you click on a file it automatically opens it for editing, sometimes I just want to download the file, not open it for editing.

8... Multiple other issues that make using it somewhat painful and not intuitive.  It should work like my file explorer.