Contracts that restrict you, whether non-compete, NDA or otherwise, should be as narrow as possible and limited to a reasonable time. Overly broad restrictions are stupid, dangerous, and unnecessary.

I had quite a bit of discussion about this for my current project. It had two non-competes; one for the client and one for the intermediary, and the important one, the one by the client, sounded very broad and vague, and I wanted explicit and in writing how broad they meant it. (Turned out to be only about a handful of their direct competitors.)