Here are my observations from using urban 72kW chargers:
Went to the Carlsbad charger. I have a Model S 100D. Charged from 29% to 80% = 168 miles. Got a nice constant 74kW, at close to 80% it tapered down.
Whole charge took 42 minutes. Unlike the 120kW chargers these are not paired, so you get full current always.
At a 120kW charger this would take about 32 minutes. So, here it was just 10 minutes more.
At Qualcomm with their 120kW chargers if your neighbor is already charging, this would also take 40+ minutes for you.
Basically, there is almost no advantage to try to go to the Qualcomm charger to get charged faster!!!