One typically expects security devices and products to be, well how to put it – secure? Yes, secure. But it appears that security vendors struggle with bugs and the like, almost as much as normal software. There have been a number of high profile AV definition update failures in the last year, Cisco had some recent issues in their PIX firewall units and at the end of October, there were a number of reports of Checkpoint UTM-1 and Safe@Office devices rebooting spontaneously. There have been complaints in various forums that Check Point took several days to respond to the problem.
I accept that not everyone can ensure 100% non-bugginess – however I do expect vendors to come to the party with information when problems do occur. Based on the actions of some vendors, this is not a given.