A Preview by John Siracusa Native Applications Native Mac OS X applications, be they Carbon, Cocoa, Java, or BSD, are nice and snappy.
Cosmetic problems abound, but stability is quite good for a developer release.
The newer apps are the flakiest. There is very little consistency in the UI widgets at this point. A particularly annoying example of these foreign widgets dressed up in Mac OS clothing is the behavior of hierarchical menus in Cocoa. Experienced Mac users do this quickly, and without thinking. The orange path is the only way.