This DAC is unbelievable, it works flawlessly with my Samsung S5 running tidal and flac on a micro SD card. Sound is phenomenal for my Noble K10s..... relaxed, crystal-clear and punchy bass. I use this in a portable rig with a huge extended battery on the S5. The DAC will run your battery down quickly and less you have a extended addon. I've also hooked it up to my MacBook Pro and Windows 10 PCs it's outstanding on both. The build quality is also top-notch all aluminum construction dissipates heat well. They will generate some heat but it's totally normal. Just for fun I put it in high gain mode and hooked up my Beyerdynamic DT 880 pros 600ohm and it sounded amazing! I never thought this little device would have the power to drive this hungry can. Pair this up with an old android phone with an extended battery and you have an awesome portable rig. Couldn't be happier!!!!!!
 

OK first let me start out by saying the wait time is brutal! I think I checked my tracking numbers 763 times. My wife kept telling me have patients my young Padawan it will be worth the wait and as always she was right. These monitors are outstanding, as I write this I am listening to the new Pink Floyd endless river and it's amazing! It's interesting a lot of the other reviews have touched on this but it just does everything extremely well. There's no real emphasis on any one frequency, is kind of interesting to hear you just get lost in the music. I never realized when I listen to music with all my different headphones I'm kind of internally thinking about frequencies and how they affect my listening experience. With a K10 you truly get lost in the music. 
 
As far as my sources go I do have a Fiio X3 II the sounds pretty good with it. I found it all Fiio products have a little bit of a cold feeling to them and these will definitely show you that. I recently acquired the Centrance DAC port HD and it has brought the noble audios to a different level of enjoyment that I didn't realize possible. To my ears this is a marriage made in heaven. I believe the Centrance has a warm beautiful sound. I believe having 10 different drivers in each year really makes a difference when you put different sources to it. It can reveal details that only 10 drivers can give you.
 
Brandon and Sunny have been unbelievable through the whole process. Incredible customer service getting back to me from email questions in under a minute. I can't say enough about it the whole experience with Noble its been great. Just prepare yourself to wait it out, 6 to 8 weeks is easy to talk about but hard to wait for. Mine was a little compounded from a mishap in Canadian customs, pretty much added an additional week. Of course not Nobles fault.
 
Highly recommend these badass chunks of beauty!!!!
 
Sterling