I had put up a post similar to this a while back. I believe Marc was going to respond on his experiences to date of the problems that he has encountered or anyone else for that manner.
I've addressed the upgrades in a number of threads. The bottom line is I have done 4, one of which added ISO 14001 at the same time. All were former clients which I worked with during their original implementation. None had to add any systems or such. None took over 5 working days to change documentation and such. But - 2 were very small companies and the other 2 were under 300 people.
I personally believe the biggest change is in the ISO and consultant rhetoric. My opinion is people are reading much too much into the 'changes' - over interpreting. Seeing things they want to see which aren't there (see recent thread on Continuous Improvement).
It is interesting to look back at companies I worked with during their registration. In fact I'm sitting at a desk in the same company I started playing with ISO with 10 years ago. I'm not here for ISO - I'm completing a number of PPAPs and working with several customers in the Corrective Action end of things. But as I think back over the upgrades at other companies I worked with and I think of what they were and what they now are - heck, I can show tons of continuous improvement totally unrelated to ISO. Companies evolve and to survive (compete) they either corner the market (ala Enron), have political ties (ala Carlisle and the military industrial complex) or they continuously improve.
None of the companies are particularly unhappy about their ISO trip, but none any longer sees ISO as a tool. They say ISO 9K was most useful during the implementation phase - new thinking, new set of eyes and all that. But now - it's just a yearly game where you Pay The Man. As one company owner said: "If the auditors would just take the money and not come it would be fine with me."
I will also say all 4 - registered for a number of years now - have entirely classified their registrations as a business expense, although they were initially enthuseastic. It has become another business game.
Each of these companies was making good product when I first was involved with them years back (marketing and/or customer requirement came along) and nothing has changed there. ISO 9K has not improved anything they would not have anyway - or so they say.
(NOTE: Throw rocks now and get it over with folks...)