The last edition printed in 2005 is not 'updated'. It only contains what amounts to grammatical errors and omissions. In a few cases it corrects text information regarding packaging. It doesn't have 'new' info.
For book lovers, it is also printed in lighter weight paper- it is a good 1/8" thinner than the original 2003 version. Either version is a 'must have' IMO- just not both.