No, they are the worst thing you can buy "for an emergency."
Sometimes people buy them with no intention of transmitting, they see the Baofengs as cheap VHF/UHF scanners. But they make terrible scanners. Their frequency range is very limited, their scanning is very slow, their selectivity is poor, and they are missing almost all of the bells and whistles that come with modern hand-held scanners.
If you think you might want to transmit during an emergency, then just grabbing a Baofeng or three off the jungle site and hoping for the best is a TERRIBLE plan.
A popular line of thinking is, "but during an emergency, you can use any radio and frequency necessary." Yes, that is logically true but those who say it are conveniently ignoring several aspects of reality: Unless you have a business license or an amateur radio license, you are not allowed push the Transmit button on a Baofeng. If you cannot transmit with the radio, then you cannot practice using it. If you cannot practice using it, you are NOT PREPARED to use it in an emergency and your own incompetence with it could lead to loss of life.
You also have to consider what kind of emergency you are likely to face. If you're out in the back country where there is no cell service, then a VHF/UHF radio is very unlikely to do you any good either. You need something with satellite capability in this case.
If you want to be prepared for an urban emergency (tornado, flooding, terrorist attack, war) then you want TWO radios: a scanner for receiving weather, listening in on emergency services (if not encrypted), and listening to others on various services. To communicate: a CB, FRS, or MURS radio. A $25 Baofeng CANNOT be used as any of these.
Potentially the best option is to learn about radio, get an amateur radio license, AND THEN purchase a Baofeng or higher-quality amateur radio. Then you will have the skills and license to actually operate the thing correctly when needed and legally when not.
Disclaimer: I own a Baofeng and use it legally.
