I’ve migrated my netbook’s Ubuntu installation to Xubuntu. The main reason is that Unity requires 3D acceleration that my netbook’s Intel card could not provide, so everything ran with software rendering. This wasn’t a major problem, but if I want a shiny-but-sluggish OS I could boot Windows (literally – the netbook came pre-installed with Windows 7).
I did it without reinstalling from scratch, just by installing/removing packages. So far it seems to work, but hunting down the last remnants of Unity and Gnome will take some time.