We've used their service with Hubitat for over 3 years now and have been very happy with them. They respond within seconds of Hubitat (HSM) triggering with a phone call and text messages. They only call one phone number but will text with multiple numbers at the same time so if you miss the call or are unavailable someone else can cancel false alarms etc. I don't believe they can determine what is triggering the alarm (police, fire, flood etc. although there are options for these in the driver/app) but they do contact the police shortly after if you don't cancel in time. We had this happen last year where we were in a no cell coverage area but we added our neighbor to the account for text. They sent the police and communicated with our neighbor. (turned out to be a bad contact sensor of course 
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I just followed the instructions here:
If you need a certificate for your homeowners insurance they can provide that as well. After the discount on our premium I think we only pay about $3/mon.
I hope this helps and am happy to answer any other questions you may have. It may sound like I'm promoting them, but I am in no way affiliated with them. Just a happy customer and glad that they integrate with my beloved Hubitat.
P.S. I believe they are affiliated with Konnected who wrote the integration for Hubitat for their Konnected Device, however I don't own one and am instead using the amazing Hubduino integration to monitor all my contact sensors. Neither is need to use this though.
