Pangris:
I'm kind of new to the argument - I've only had a Para PXT for about 18 months, and have little experience with the older Colt/Browning extractor.
However, I think that they do work, and are inherently more reliable than the original.
If they don't break....
IMHO the Colt/Browning extractors fail softer - the gun becomes much less reliable, rather than simply failing entirely. I've since retired it for other reasons, but my Combat Commander has been through about three extractor since I inherited it. The first one was damaged somehow, probably by Wolf steel cases. The gun continued to work, but was much more reliable when the extractor was replaced.
Then a shock buffer self-destructed inside the gun, leaving bits of itself all over the place. Reliability went completely south, but it would get a shot or two off. Didn't take long to figure that out, but the extractor had to be replaced again.
Meantime, the PXT in my Tac-Four broke. No more extraction at all....
Which is better? Either way you're in deep stuff. However, IMHO (and bear in mind that I'm not a gunsmith, don't buy into hype too well, and only drive by a Holiday Inn Express on the way to and from the range), if the folks at Para are indeed doing 100% inspection, the overall design is just bigger, and more likely to hold together. Lots of little bits inside, but there are only two failure points I can see - the little projection that holds the halves together, and the square section that links that to the body of the claw portion. (I suppose the little spring in there could fail, but it might still extract anyway if dirty.) Meantime, if you survive the failure, the part is a drop-in, and nearly indestructable otherwise.
Which is better? I'm not sure. I wouldn't (didn't) let a PXT or the lack thereof keep me from a purchase. I think Browning would have entertained a design like this in 1911 if it'd been possible to make it without serious extra expense. IMHO the standard claw is too tiny for reliability with a round this size anyway, but it is impossible to self-spring anything much bigger. I'm told, too, that the originals were made from a spring steel that made it difficult to "tune", but once properly done, was very reliable. More recently a "tool" steel is used that's easy to set up, but eventually fails. There ought to be a marketing opportunity there someplace....
I like the idea of offering both, but....
Regards,