In 2010 they were synonymous with the cloud. Back then it was Dropbox Dropbox Dropbox.
However, as time went on a number of competitors arose and the questions and flaws regarding Dropbox mounted. There were errors, bugs, data loss and the biggest of the bunch are privacy/security issues. Heck they even put Conoleza Rice on their privacy board! She is one of the people who helped set up the sureillance state.
The bottom line is most users blindly trusting it have a 2010 POV. I apologize for recommending this one years ago. I was wrong.
This is a very good way to sync your files between different computers and devices, and backing up your files.
The only thing that bugged me was the fact it killed the explorer.exe process during installation for me, so I had to do Ctrl+Alt+Del to open up Task Mgr and re-run explorer.exe.