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It's not been professionally reviewed, but there's a large body of mostly satisfied users that post feedback at Amazon, where its overall score is 4. 4 stars following around 1,750 reviews. The Kidde KN COSM IBA Est. $40, previously known and sometimes still available as the Kidde KN COSM IB, is the hardwired version of the Kidde KN COSM BA but one with a significant difference: It can interconnect with up to 24 Kidde alarms plus an additional six sounding devices. However, it relies on a hardwired connection to do so, so unless you have an existing network of Kidde alarms, it's best for new construction or a major renovation project. Like the KN COSM BA, it has a voice alert to announce whether the hazard is smoke or carbon monoxide, but that and location information is not passed to other alarms in the system.