I've just installed Join on all my devices and think it's brilliant, however I've encountered some problems, in order of severity... 1. Whenever I receive a notification from another device to my Sony Xperia Z5 Premium it crashes the device. The screen flashes alternately between my background wallpaper and a black screen. It also comes up with the message Xperia System UI has stopped. The only solution is a hard reboot. Consequently I've had to stop sending any notifications to that device, which is annoying as it's my main phone. 2. I enabled encryption on all devices. When I enabled it on my work phone, a Moto G (1st Gen) it triggered a warning from Maas360 that my device was not encrypted, which breaks my corporate security policy. It was unable to encrypt the device again to clear the error. The only solution was to disable Join encryption on all my devices. 3. Some actions on some notifications don't work. E.g. the BBC iPlayer Radio app has play / stop button in the notification. The stop button works, but the play button doesn't. Sony's Music app has previous / pause / next buttons which also don't work. 4. Chrome extension notifications don't always show up. Sometimes I have to click on the extension icon in the Chrome toolbar to trigger the notifications to display. For now I think I may have to revert back to my current set of custom AutoRemote notifications and Tasker for syncing notifications across my devices. That allows me to completely customise which notifications to send where, and what I want them to look like. The only complaint I have about that solution is that I can't group notifications!