It's almost like the system in the US favours business over individuals. Na, that can't be it.
In a previous job there was one in my contract (idiot boss put it in after he found a contract online) not realising that while a restrictive covenant can be enforced it is under very strict conditions (basically stopping you from buggering off and taking all the employers customers with you and some others).
Guy was a dick and told me he'd enforce the covenant (we didn't end it well, they where deeply scuzzy), I just laughed and said "I will see you in court then".
I was leaving to start my own company, not working with any of his former customers, not poaching any of his other staff (wouldn't have wanted them) and in a completely different industry so literally no overlap except we'd both be building things for the web.
I had my new company solicitor send him a letter basically saying "f* off and die" in legalese and he went away, last I heard he was bankrupt again (third time).
Most sentiment seems to be that they "would never hold up in court". Every once now and then a case does come up though http://arstechnica.com/tech-policy/2014/07/amazon-sues-ex-em...