I have a Nest also and it is pretty decent. I wish they had just come through with making it more "accessible". Also, it does not connect to other smoke detectors, only other Nest Protects. For example, the Halo also has the alarm wire so that it can trigger any other smoke detectors on that line. Of course it can also trigger other Halos without the wire. Nice plus for our house as they are all too expensive to just replace an existing set of new detectors. Maybe once the old ones start to expire.