Mark, I was having some extraction probloems on my new Custom Target - in 45. Killed a match for me - The Aftec is just a more reliable extractor since it doesn't count on the correct bend of the steel, the springs take over for that -
If you have a well tuned extractor and a spare, you're probably fine, but a 'normal' extractor wil probably break before an Aftec - one less thing to worry about for me in USPSA matches