I try charging my Tesla Model Y with the new CCS adapter available from South Korea with very mixed results. It could have been the Electrify America station I was using or some other factor, but this wasn't what I was expecting based on other reviews. I'd hold off buying the adapter until I either really needed a CCS option for a specific trip, or it's available in the US and fully supported by the CCS networks here.

If you're looking for the adapter it can be found here:
https://www.harum.io/products/tesla-c...

Good details on the adapter and a successful test of the adapter here from @Sibs :
   • Tesla CCS Adapter: Everything you nee...  

Chapters:
0:00 Preparing to fast charge
1:44 New CCS to Tesla adapter
3:12 First charging attempt 350 kW pedestal
4:16 Charging failure
5:40 Second charging attempt, slow ramp up
8:12 Third charging attempt 150 kW pedestal
9:24 Charging attempt 4 issues continue
11:17 John's successful charge and variables
12:51 Software and communication
14:10 Cross checking with the Supercharger network
15:19 Charging graphs and costs
16:51 Do you need it and where to find it