Watch out for what packages you rely on, and what repository those packages come from. If they're in universe, expect your bug reports on Launchpad to go unanswered or unresolved. The only way to get fixes in them is to go upstream to Debian. But note that not every bug in a universe package is actually fixable or broken in a Debian world, because the bug might be down to interactions between a decision made by Canonical with packages in the main repository, and those for the universe package.