[rogerbinns]

Dropbox tends to sync more reliably than other services. This isn't something that affects every user. But a sync solution that doesn't work well enough for you despite being cheaper, easier to setup, space etc, isn't that useful.

Dropbox is the only service (I know of) that supports Linux. While it may not affect you directly, it does affect who you can interoperate with. For example in a startup with developers using Linux, you'll need something that works for them too.