"George Patterson"

Altimeter settings don't tend to vary a great deal from one controller to
the next. If you're issued one that differs by more than a few points
from the previous then it's a good idea to check on it.

I rarely get an altimeter setting from a controller anyway. I make a point
of picking up the setting from AWOS stations in flight and from ATIS
before arrival or departure. As long as you tell the controller you have
the ATIS, about the only time they'll give you the setting is as a gentle
notice that you don't seem to be flying at the altitude at which you're
supposed to be.

No. They give you an altimeter setting almost every time you enter the
space they're working on initial contact. The point of this is that it
results in all aircraft in close proximity showing near identical altimeter
readings. You should also give the controller your altitude when you're
level after any change. Where do you fly where ATC doesn't give you the
setting on initial contact?

moo