I REALLY like and trust Caspians and use the series 70 unless someone really wants to keep the firing pin safety stuff. I used Wilsons about 8 years ago, had a few lose tension, tried Ed Brown ones, had one lose tension. In the last 6 years, I have not had ANY Caspians lose tension, except for the guy with overcharge and blown case - yes, he lost tension. This is well over 200 extractors, most in various race guns and Standard guns with from 6,000 to well over 80,000 rounds on them. My sponsored shooter changed his after about 60,000 rounds because it had a noticeable groove worn in it. Still working fine. A lot of these guys I've trained to check their extractor tension every major cleaning - 500 to 1,000 rounds.
I have mixed feelings about Afteks. I have 6 of my competition guns out there working flawlessly with them,but four of them needed spring replacement within the first 500 rounds. Lost tension. These hings cost well over $100 in Canada! Better a pair of fitted Caspians for peace of mind.
By the way, 5 years ago, with a 9x40Armco bottleck cased gun (sorta like a .357SIG) I used a modified Caspian .45 extractor and that thing between my wife and I we've put over 40,000 rounds on it. With a scope on it, it still puts all its empties in about an 8" area. Always has. Checked many times, never readjusted. I plan to try this setup on one of the .40S&W Standard guns one day...may not improve anything as they work pretty good with the .38 ones, but a little more positive?? The .45 hook is a LOT bigger...