js> I'm a big fan of bridging the hosts interface so that the
    guest
    js> kvm can access the LAN directly

I agree that it is the best way to do set up VMs for many
purposes.

But I'm talking about another use for virt-managed KVM VMs: I like
to
simulate setups that are independent of the local network, and
setups
that are shut off from most of the world.  (Also sometimes for
quick
"create, run release engineering/qa scripts, destroy" purposes.)

I then like to have a rapid procedure that stands-up these
configurations.

For such a simulation the default NAT works well, and I'm trying
to give
it a transportable configuration with less volatile ip addresses
and
some repos.
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