My current travel setup is my Android phone + original iFi Nano iDSD + Oppo PM3. I don't really use DSD. Nothing wrong with the Nano, but have had it for about 3 years and I'm wondering if significant sonic improvements are to be had from current designs? For example, does Nano Black Label sounds much better? And the Nano is a bit bulky for portability, so smaller would be nice. A while back I looked into the new Dragonfly but there were operating issues when used with Android; wondering if those might have been solved? The Ultrasone Naos also looks interesting. I haven't been keeping up with all new entrants into this space so more than happy to go for something that fits the bill and I'm not aware of. Thank you!