For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
Plover - Browser Airdrop - transfer files to anyone, any device
Google Drive - Access and sync your files anywhere
Starfiles - File hosting done simple
Mega - Secure File Storage and collaboration
Filewatch - Find your public files, before someone else does