I use it a lot to send flattened mockup PSDs to different devices at work for testing app UI/UX stuff. Works fine with iPhone 5C, 5S, 6 Plus, 6, iPod Touch, iPad Mini, Mini 2, Mini 3, Air and Air 2. Sent from late 2012 iMac 27" and late 2013 rMBP. And this is on a massive and complex WiFi network. At home it works fine on our Airport Extreme AC with the iPad Air 2 and Mini 2, as well as our iPhone 5 and 6 Plus and my mid-2012 rMBP. Only devices it doesn't work with is the 3.5" iPod Touch and iPad 2 but that's due to hardware limitations. Sucks that so many people have trouble still since we use a ton of devices with it and have no issues. I mean sometimes it will take a moment for a device to show up, especially an older one, but it's not bad.