It is important to make sure that you have induction-ready cookware to use with your induction buffet warmers. Induction-ready cookware must be ferrous, or magnetic, so that the magnetic field generated by the induction warmer can heat up the pan. If a pan that is not induction ready is used with one of these units, no heat will be generated.
One benefit of using induction buffet warmers is that, in some cases, they can double as cookers. This will vary by model, so be sure to check the specs on any unit you are considering. Some induction warmers are meant to be warmers only, but some do have enough power to pull double duty on some light cooking.
The increased safety of using induction buffet warmers is one of the main reasons to switch from traditional warming options. While canned heat can be a fire hazard and an electric or gas heating element can burn, induction only heats up the pan the food is in, reducing the chance of accidental burns.