You'd think Yahoo would have the resources to hire a Mac team that knew what they were doing. This barely works. File transfers work fine for a few times, then just hang, requiring a relaunch. Contextual menus in the main window open information for a completely unrelated user. Basic, basic stuff that is really a no-brainer to program in Cocoa doesn't work. As a programmer I get the impression that the codebase is messy, since simple trivial things are broken or dysfunctional. The interface is nice, much cleaner than the old, but that's so far all it has to recommend it. Seems more alpha quality than beta at this stage.