[hanula]

One and only reason I started using Dropbox was because of their desktop app. It was there, available for Linux, simple and easy to install. One click to create an account and I'am a happy user since then, since the beginning. Dropbox is great.

[mhd]

One important factor for me is that they went beyond the call of duty on Linux. Dropbox itself had some Python scripts available that made it possible to install and run the application, even if you weren't running one of the major two desktops – or even no X11 at all. It was a bit hackish (stubs for non-present GUI libraries instead of a proper non-GUI daemon), but it got things running.