I've always signed them as a sign of good faith (sometimes amending with my own IP so there's no misunderstand about something I've already done if the company

I've always signed them as a sign of good faith (sometimes amending with my own IP so there's no misunderstand about something I've already done if the company is in the same space) figuring that they have no teeth. In 30 years in the industry moving between small and large companies here in the Seattle area, having signed a NC everywhere, I've never even been asked about a previous NC, nor do I know anyone else that's had an issue. From what I understand, they are very difficult to take action on. Perhaps in the upper echelon's of management this is more of an issue, or for very narrowly-defined technologies or market-segments.