I used to use it daily to sync projects, music, and documents between computers too. It was really nice once I got it configured to my liking. I would sync my work computer to a external hard drive and the external drive to my home computer, thus creating a very powerful sneakernet and an implicit backup on the external.

I reluctantly installed Dropbox one day after forgetting my external drive at home. Honestly, that was the beginning of a miserable time. Dropbox never really delivered, it took forever to sync, and constantly caused the internal disk to trash. I had tons of other problems with Dropbox over the years and was very happy the day I quit using it.

I still have a unison alias in my .profile

    alias unison="unison -logfile /Users/eddie/log/unison.log"

I really miss the control Unison gave me.