Looking at Apple's track record, I don't expect anything else than a good-working service. Not that anything Apple touches turns into gold (MobileMe...), but seeing that this is a major new feature for them, they've probably tested it quite well.
I do hope that they've tested it as well. And I hope that testing is extended beyond just Steve Jobs a few choice employees. Unfortunately, I highly doubt that to be the case...
The only gate near and dear our little-HN hearts!
(Other than nand-gates)