It paid for itself the first time I used it. The code showed the EGR was not working, a vacuum line was broken. Better gas mileage and the transmission shifts much better. I did order a extension cable so I can sit in the cab and check codes. I think this is a must.
Its a blast being able to diagnose whats wrong with my car rather than taking it to a mechanic who's gonna charge me a arm and leg thanks it works great