The above is a discussion on PR2005 CD vs older versions. I strongly believe that for PR, the newer version is better. However, Kaplan
did not change their version from 2002 through 2004. I'm not sure for 2001 but the odds are I don't think they changed their edition anyways. Book editions are to my knowledge absolutely same.
In terms of CD content, I believe that it is good to buy those Kaplan
/PR books WITH CDs as it will give you a "feel" of the acctual test. Also, rest assured that unlike OG, the question banks on the CDs are much wider than the questions included in the actual books.