As a PA State Trooper, the JNet tool is great. When I was working out of Philadelphia and encountered someone without their license, it was great to print up a photo of the guy in the car with the IR printers and walk it up to the guy and ask, "If you are Joe Smith, then who is this?" Philadelphia PD, to my knowledge, never had that ability. Local departments, if we were nearby, would ask us to swing by just so we could JNet someone in our cars for them to see their face.
While these other tools aren't available in the cars, JNet also gives you access to all photos taken with a mostly statewide law enforcement/corrections photo system called CPIN. It also lets you throw together line-ups pretty quickly, give dispositions on all your traffic citations/criminal cases, and numerous other uses.
Now, they just have to get the CLEAN system updated and I'd be pretty happy.
The most important thing in conversation is to hear what isn't being said.