Jonny Deluxe here... Twiddling with my new Dragonfly on the following devices:
Samsung Galaxy Tab Pro 10.1 (KitKat 4.4.2 < I think>)
This tablet is running great, plug and play with the USB OTG and Dragonfly... no tweaking.... audio is global across the device.
HTC One M7 (Lollipop 5.0.2)
This phone is working with PowerAmp and USB Audio Player Pro. Not really working elsewhere from what I can see. I'm hoping to change that through the brilliant minds of Head-Fi.org