I turned off my door beeps - lets my 5mo twins keep sleeping while i open the trunk.
Real-time datalogging (approx 3 measurements/second) is pretty useful... particularly ignition timing vs. rpm & intake temp and requested boost pressure vs. measured boost. Just remember to keep your eyes on the road, not the laptop.
oh... there's also wallet performance: dealer said i needed a new throttle body -- vag-com said i didn't. TB adaptation and 30,000 miles later, vag-com is still right. (saved $400+).