Still having stuttering issues with with OSX 10.9.4 and Premiere Pro CC 2014 on my latest gen Mac Pro desktop running D300’s. Switching to software only mode resolved the stuttering. I fear we’re not completely out of the woods yet and people on the Adobe forums fired up the ticker tape parades too early.
Blogs posts like this should wait a few more days before giving everyone a false sense of security in the recently released updates.