However, at some point there are too many shots to even show up for, let alone do the more involved tasks you mention, and I think this is the situations some cities using the service found themselves in. At that point, it just becomes a data collection project, with unclear goals.
For what it is worth, I think we have ShotSpotter in my location, but have never seen police physically responding to shots fired. That is not to say it isn't useful in other locations