Depends on who offers it. Our County Sheriff (Minnesota's Ramsey County) runs a first rate program. We met weekly for 3 hrs per session and took 10 weeks to complete. I just finished 2 terms on our city council so was well-acquainted with our law enforcement/fire services/county emergency services. As a retired federal employee I've taken previous courses via FEMA. I've also done some ARES coursework.
They made no pretense of us ever getting 'called up' to handle a large area disaster (the pros will do that) but we could be called to handle things like crowd control and/or media coordination. But I did get a nifty backpack w/reflective vest, a green hardhat, flashlight and a multi-tool to close gas mains and break through tempered glass (vehicle rescue).
Worth it.