And a cheaper one, you might add. These Macchina guys are anticipating $55 just for the interface board. But then they claim they made it as small as possible, which is bullshit because it's multiprotocol. They say they made it small so that you could fit it under the dash or hood, but then they went and put an OBD-II connector on it which just takes up a lot of space. If I'm permanently installing it, I can splice into the wires I need. I also don't need protocols I'm not going to use. Then they added an xbee module slot. xbee modules are primarily used for long-range communications. Up close, you use bluetooth or wifi. You can get an esp8266 module which goes into an xbee slot, but the module they specifically talk about is the new cellular xbee module. There's no reason to give the device a cellular uplink unless your plan is to use it remotely.
Which brings us full circle: this device was designed first and foremost to be used as a weapon. It's designed to be installed into a target's vehicle, and to be used to attack the vehicle remotely. We know this because of their choice of wireless interface module standard, which is oriented towards long-range communications, and because the broad multiprotocol support is otherwise at odds with the desire to make the device as small as possible. So is the addition of a soldered OBD-II connector, which is not desirable in many installation types. It is useful, however, if your goal is to connect as rapidly as possible.