It's dumb technology--it's like everything the MIC has done to try and re-market to police agencies, it's unnecessary and pretty much worthless.
I'm well aware police officers aren't specifically sitting around waiting to be dispatched, but my neighborhood has a lot of idle officers that exist as a 'show of force'. I don't mean that in a derogatory way, I just mean that this officers are already dispatched to my neighborhood as a way of reducing violence. I think that responding to areas ShotTracker has flagged would be both within their capabilities in addition to being in line with their duties and priorities.
They use it to aggregate reports and consider increasing patrols (I say consider, because they often don't look at it anyway ).
Though I guess this is probably good motivation to go to one of the Chi Hack Nights, because I'm sure if someone there doesn't know how Chicago is using the ShotSpotter data, they probably know how to find out.
If ShotSpotter can give a location to within a couple hundred feet within 30 seconds of shots being fired, then the officers already have a much better chance of doing something useful.
I think the real opportunity would be combining data from ShotSpotter with other data sources and using them for predictive/preventative policing. That's much harder to quantify from a sales perspective though.