I have a T4 - not the mobile version (I had a Nanocom for my P38A - since sold).
The T4 is more versatile in that it is not locked to a specific vehicle nor model. The T4 software is slow and clunky (complete with spelling errors ) and one has to change leads for different systems (not sure if that applies to the mobile unit) - for general use I prefer my Rovacom Faultmate (but it is VIN-locked to a specific vehicle). My GAP IID Tool isn't as convenient but it's always in the car.
However, with T4, I have pretty much the full range of plugs, leads, and sensors so it can do things the Nanocom and Faultmate can't do, e.g., read voltages, pressures, etc.
I also have an early Testbook with the touch screen but it needs a new SCSI CD-ROM (I haven't been able to find one).
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