"O. Sami Saydjari" wrote:
So are we are concluding that it is best to switch to ATC altimeter
setting as soon as they give them to you

That's what I'm concluding. You?

and that differences from local airport settings, except when you are on
approach to your destination (where you use that airport's setting).

I'll always favor an altimeter setting ATC gives me over anything I hear on
the ATIS. The ATIS could be up to an hour old; the controller is looking
at the most current reading right now.