[greglepore]

Don't for a second believe that they're unenforceable. They are in many/most states, if it is accompanied by separate consideration-ie not just continued employment under the same terms, but as part of a promotion etc. They also have to be reasonable is scope, which can be very industry specific.

If you're concerned, get local counsel's advice. Don't just assume anything.

MRM is correct, your new employer is likely to be concerned regardless.