I've never noticed bandwidth/sync issues. Sometimes it takes a couple of minutes to get it's head round things; but not often (Dropbox really is great at "just working").

It also syncs over the local network which speeds things up no end when I work at home.

I don't compile any of these because they are python, php or ruby projects (I only write C at work :P). I do have a Ruby/Redis project that I run from the Dropbox folder for testing - that has never generated any problems to my knowledge.