Dropbox allow me to share many files with friends with zero complications, just upload the file and share, its that simple.
The option of gain more free space through inviting friends is something great.
Is super easy o set up and use, in any platform (MacOS, Windows, iOS, Android, etc).
I`ve been using dropbox for more the 8 years, and so far is my main personal storage cloud, allowing me to store all kind of files, in fact, i use dropbox as a virtual deskptop, everything that i store on the desktop of my personal computer automaticaly sync to dropbox in the cloud, this help me to have a real time backup of my data, and can acces to it from any of my devices all around the world, this configuration gives me the security that i`m not going to lose any of my important files.
Need to improve in certains areas, but the Dropbox team is always releasing new updates with new features that make dropbox one hell of solution.
Dropbox is a "must have" aplication, and i don`t think that anybody can refuse that, you defenily MUST HAVE dropbox in yours aplications of daily use, you won`t regreat it.