Good review, Chris. I must say that after months of using The AudioQuest Dragonfly Red, it has brought me back to listening high res audio with headphones on a mobile device. Traditionally, I've been listening to Tidal HiFi via AirPlay on an Apple TV connected to a Marantz 7.1 receiver, and through my Mac on Mackie desktop speakers. Now, I plug it with my Apple Lightning to USB camera adapter on an iPhone 6 and am good to go. I also use it with the Onkyo HF Player app to play some of my flac music from HD Tracks. Paired with my old Grado SR 80 on a beach recently was just pure bliss. At home I use it in desktop mode connected to an iPhone Lightning Dock, a V-Moda Crossfade LP2 and an O2 headphone amp.
I don't know if there's a better value in DACs today that's small enough to go anywhere that I can conveniently use with my iPhone (or an Android) than the Dragonfly.