I agree that S&W got it right with the external extractor. But I will stick with the internal. I have a few extras and it doesn't take long to change one out.

I have a series one Kimber Classic Custom with about 500,000rounds through it. It's on it's second extractor.

In case your wondering about the round count, it's accurate. I loaned the gun to an indoor range for a couple years. This is a testament to the good ole 1911. It's doesn't need external extractors, full length guide rods, a rail, shock buffs, or any other ****. Stuff a good magazine in it and it's good to go.