Many owners learned that an adapter or app labeled compatible still failed at the charger. Non-Tesla drivers reported Superchargers that wouldn't start, either because the site wasn't open to other brands or because the adapter lost communication, while the same adapter worked at a different network's stall. Checking a site's openness before driving there seems to save trouble.
Plug-type mix-ups were just as common: people bought a home charger or cable with NACS when the car needed J1772, or the reverse, and had to swap it. Buyers now weigh which standard to choose for the next car, and some noted adapter use can affect warranty coverage. CHAdeMO owners had the fewest options and ran into payment problems.