See this site for all the error reports:
Google "canon" and "E18" for more information.
Here's a PC World report on the problem:
Class action lawsuit:
The point of my posting these links is that a certain percentage of people who buy this canon WILL end up getting the e18 and will lose all their investment. Ordinarily that would be acceptable, you would just send it back to Canon and get a new one. But because Canon refuses to admit this is a problem and Canon will not fix it for free, this problem becomes a fatal one. So when you buy one of these cameras I think you should be aware of the risks involved. That is why I posted all these links.
I understand why Canon is not admitting this problem and will not fix it. It takes a technician a lot of work to completely disassemble the camera. Also probably the percentage of cases is high enough that it would cost them a lot of money to send out a free camera for all the e18 errors. Finally it costs Canon a lot of money to reengineer the lens drive mechanism to fix the flaw. It is easier and cheaper for them to alienate a certain percentage of customers who have no recourse but to complain about their tactics on a message board.