We supercharge regularly here, every few weeks or so, have never experienced any issues, always good charge rates.
The supercharger at the Markville mall (3km away) is also excellent, we have seen no issues with either location.
There is one poor plugshare report:
PlugShare - Find Electric Vehicle Charging Locations Near You
Feb 28, 2019
Andy
Tesla Model 3
Very slow at this time. Only 10kW.