It was certainly one of my biggest complaints when building up my Mach 6 a few months ago. I've not had a problem yet, but I agree with Vernon's article that the negatives outweigh the benefits. Somewhere in Pivot's literature they say that their PF BB system eliminates the need to have threaded metal cast into their Carbon molds...As if that's a bad thing. Prior to pressing my BB in with a home made jig that scared the bejeezus outa me, I called Pivot to ask for advice. I was told to press in one side at a time, cuz the Pivot tech guy explained " I saw one guy pressing both cups in at the same time and they got a bit askew...the whole bottom bracket shell exploded." I swapped out countless bottom brackets over the years and when I next have to replace the BB on my M6, I will be freakin' scared all over again, especially since it's lock-tite'd in!