employment over big bad employers trying to restrict individual rights. Noncompetes must be reasonably limited in geography, industry and time (length). Many states are limiting them by statute and they tend to be next to unenforceable in Europe.
If you are a very senior executive they tend to be enforceable more than against a junior exec or midlevel manager. More and more jurisdictions are wanting to see monetary consideration given. Courts do not like taking away somebody's right to earn a living as a general principle.