I have white rocks on my roof! and before anyone asks... Yes, I live in California. It NEVER snows here.

I signed one. NEVER DO IT AGAIN. Previous poster is right US California law invalidates non compete clause. It does get sticky about derriative work. Unless they are willing to pay you for the next 6 months your salary after you leave, then HELL NO! Even after modifying the contract, command a very high price for your services. Unless they pay it, they are not worth working for. Personal opinion, ones man's experience.