Hi!
We're a group of three Ableton DJs, and we've just moved over to using Dropbox full time for our whole Ableton library - tunes, asds, Ableton projects, everything. Written a post about it here - Collaborating on Ableton music projects in the cloud with Dropbox - covering how we did it, problems we had, and the overall experience. Apart forma few few teething troubles, it's working really well.
Cheers,
Philip