Daniel Pasco, writing on the Black Pixel blog:

As far as sync is concerned, we knew we would likely need an alternative to Google Reader as early as last year. At the time, the option that seemed to make the most sense was to embrace iCloud and Core Data as the new sync solution of choice. We spent a considerable amount of time on this effort, but iCloud and Core Data syncing had issues that we simply could not resolve.

Awesome news for NetNewsWire users; another bullet fired at iCloud.