[BJBBB]

Walmart's self-serve system(s) appear to be the most reliable of the stores that we shop. B/C scanners for big stuff are wireless, keypads and touchscreens are functional and responsive, the scales read produce very fast and are more accurate than the local Vons/Stators/Ralphs (I have done several 'calibration' runs at all of the local markets), system latency is the least of all other stores, and when I screw up, an 'associate' quickly arrives to render a fix.

And that is about the only good experience to be had at walmart.