I use dropbox so I was very familiar with the utility. However, I had not used the share folder option as a folder owner so it was nice to learn about that. I can see using this to share files with teammates. I could also envision having studfents send files to me that need to be graded, such as a written essay or powerpoint presentation.
Google drive is a great tool for collaborative group projects. I've used this quite a bit and really like the flexability, the user friendly format, and collaborative tools. I also like that you can see who edited what.