How I Use It
I use Dropbox to store files so I can access them from any device. I have been using it for years and have never had any issues with the service. There are many tools that do the same thing, but for personal use it's fine.
There are better tools (Google, Schoology/Edmodo, etc.) when it comes to collaboration, but when it comes to personal use I have always liked Dropbox as a option. The ease of use between a computer and the mobile devices is really nice.