Personally i wouldnt trust ANY automatic update system. While it is nearly impossible to keep up with all Microsnot's updates manually, I prefer to wait for time to prove out new updates for anything critical. Whether it be Cisco IOS patches, Microsnot products or any other critical application updates.

Emergency, real-time fixes for known problems and/or active exploits, of course, are always put in ASAP.

How many false positives have we all gotten fron auto update of AntiVirus proggies? Only to be followed by the next one one day later - that "oops, we screwed up with our last patch" patch.

If I had a lab with playground computers to test with it would be a different story but

... c'est la vie.