handling rollbacks in 4.0.3 and 4.0.4

[Peter Chen <petechen netilla com>]

Greetings,

What is the recommended strategy for handling RPM rollbacks in 4.0.3 and
4.0.4?  I understand that a rollback capability is added in 4.0.4. So
does this mean that if one does 

rpm -U foo1.rpm foo2.rpm ... foo100.rpm

and one of the rpm's fails to install, the entire transaction will be
rolled back?

On that note, how does one accomplish the same thing in 4.0.3 where such
facility does not exist?  Does one use "rpm -U --repackage" then
reinstall back the old packages when the transaction did not complete?

TIA.

Pete