well, since I admit that I have no control, I just purchased the 64 Audio U8. Expect sometime next week. Really stoked to hear this...I may need to sell an organ or some other gear, but new gear acquisition is so very fun.
Nice. If you have any higher output impedance Audio gear, make sure you try them on there as well as the standard low-OI DAPs most people have. They sound pretty good and bay or if most of my DAPs, but pairing them with the Shanling M2S (just shy of 5 ohms OI) takes the bass a little and opens up the rest of the sound for me. Beautiful pairing. I believe they were tuned with stage gear in mind, which typically has a higher OI.
Hope you enjoy them!