First off electric heat is 100% efficient. Putting the heat where the loss is i.e. exterior walls and windows. Having individual thermostats for each room allows you to turn down the rooms you don't use. The lower level of the heater allows it to more efficiently heat the air in the room.

Having said all that baseband heaters are usually in older homes where insulation lacked to begin with or in additions by inexperienced or cheap owners/builders.

The short answer is a qualified maybe