For me it's kinda iffy. I'm using a jailbroken (lol) 2011 MBA and an iPhone 6. But my brother's MBA is the latest and he's also seeing some reliability issues. We both ever got it to work iPhone -> Macbook, only MacBook -> iPhone. And that doesn't always work either. I'm wondering if I'm the only one experiencing issues with it or is it just buggy because it's new and Apple is like that now.