Last November I blogged about Apple's newest and free operating system: Mavericks. I recommended waiting before implementing this version of OSX (
click here to read that post).
Mavericks' third service pak is out (10.9.3), and the problems when opening files still have not been resolved. If you have a Mac and are considering upgrading it to Mavericks, I recommend not doing so unless there's an app that you really need and that
requires Mavericks. Otherwise you will be frustrated by many spinning color wheels/ beachballs. And it doesn't matter if the files are local (on your computer's hard drive) or on a network share.
If you're buying a new Mac that has Mavericks on it, it's probably not worth the time and energy to reinstall the OS and go back to Mountain Lion (10.8.x), so I recommend just going with it.
So, I'm sorry to say, it looks like Mavericks may be the Mac equivalent of Microsoft's Vista-- an OS worth leapfrogging.