CCS retrofit worth it?

I don’t have a home charger yet. I have a supercharger down the street that gets charged for about $20 and 90 minutes of my time. I probably won’t have a home charger for at least another 6 months.

There is a mall about 15 minutes away that has free ccs. I don’t know how fast that is. I was considering getting a ccs retrofit for $350 - or whatever it costs - and charging there once a week while hanging at the mall.

Is it as fast as the super charger? This idea seems pretty solid, what am i over looking? Thanks!