Advantages and disadvantages of an ionization smoke detectors?

Cheap and effective when maintained properly.

Smoke detectors will run out of battery over time as they are not wired in to the houses electrical system.

Statistics show that far fewer people die in house fires when smoke alarms are present.

When the smoke alarms are placed to close to bathrooms steam may interfere with the detector, triggering false alarms.

Ionization detectors seem to respond better with high flames which could be a problem under certain circumstances.