If you have a full-blown home security system installed currently, you might not feel that this is enough for you.
We are primarily targeting people who don't want those systems either because they are too expensive or bothersome, or because they feel that it's a tad orwellian. As I wrote in another response, many of the features have been designed with home sharers (AirBnB hosts) in mind.
We detect if people are present (from sound, so not if they're perfectly quiet) and notice broken windows. If you see a broken window alert followed by people present in your home timeline when you're not expecting them, I would draw the conclusion that it's an intruder.