Even in Baltimore where police response times can be total garbage..they will show up for shot spotter. At least from my experience.
Calling 911 for anything else there is a long delay unfortunately. Last time I called for a car jacking right outside my home I was on hold for ten mins. Cops didn't arrive for another 20.
"When seconds count, the police are only minutes away"
Because shotspotter can triangulate and give accurate location of shots. When people call in the area they need to cover can be massive.