Halon Fire Extinguisher?

I just got my first issue of "Light Plane Maintenance" magazine.
I am really enjoying it. In their free book "40 Top Maintenance Tips"
(p27), they say "get the Halon extinguisher while they are still legal."

As I recall, there has been some issue that inhaling Halon can be pretty
bad for people's health. Why is a Halon fire extinguisher a great idea.

Also, this might sound dumb, but don't C02 extringuisher work by
depriving fires of 0xygen? It seems to me that in a small aircraft
cabin, one might also end up depriving the pilot and crew of oxygen as
well. Perhaps, one can survive long enough to put out the fire and then
open the air vents?!

Has anyone out there experienced an in-flight cabin fire that they put
out with an extinguisher? What was it like?

-Sami
N2057M, Piper Turbo Arrow III (being overhauled)