It's widely used here in the transport industry and can track anything on the vehicle at all as long as that thing plugs into the ECM or has a sensor attached; real time telemetry is something motor racing teams have used for many years. I agree, it's incredible what it can track and I've seen some of the reports from the ones my organisation use and from heavy industry also (trucking and mining) and it's mind boggling.
I think it's working well for the organisation I work for and they are pleased with it.