I know iWork for iCloud is in beta and all, but if Apple really wants people to use this for real work they need to learn that a multiple-hour outage in the middle of the work day is not acceptable. I don't care if they're adding "exciting" new features that are "revolutionary." When it comes to productivity apps, reliability trumps new features. They need to learn to do these roll outs without shutting the service down for an indeterminate time. I sure don't seem to recall Google ever doing this. This kind of move just screams that the whole thing is nothing more than a service used by toys, even if it is in beta.
Lesson for the future: Don't use BETA software for your work !