Hi RSA
I own the Jolida FX Tube DAC II and it is being fed signals from an Oppo BDP83 SE using a Black Cat Audio Silverstar 75 digital COAX cable. I find the sound to be enjoyable and a little bit on the warm side of neutral sound. The good thing about the FX Tube DAC is you can roll 12AU7, 12AT7, 5751 and even 12AX7 tubes with it to tailor the sound to your liking.
To me I found this DAC to be on par with a stock Schiit BiFrost Uber in my system. It was a coin toss for me to decide which one to keep but in the end I liked the tube rolling I could do with the Jolida.