[95wtlb]

Again, to draw attention to it: I never said I wanted Express to do any work on my truck, I was asking people's opinion on their diagnostic machine.
Now, thanks for the replies. I called my local Advance Auto, AutoZone, and O'Reilly's. None have a machine that reads live time data as the car runs like Express Oil Change's machine does. Our O'Reilly has nothing. Advance and AutoZone only have machines that read trouble codes and only for OBD2. I then called a local GMC dealer and found out they get $85 for the service Express Oil Change provides, so for $10 more it's a no-brainer where to go.