I've just pulled the trigger and bought one today from my hifi retailer. I was curious about the coax output..the DM 13 was flawed (thank you NTTY for all the hard work!) and I really loved the device. So I hooked it to Coax1 on a Topping DX9 and I plugged a Denon DCD F109 on Coax 2 on the same dac.
I used two identical CDs one from my collection and one from my sister's, and I made the test using Hifiman Ananda stealth, as I cannot measure anything, and of course I do not have the knowledge to do it...Switched Coax1 and 2 using the dac remote, and played same track simultaneously on both players.
Right from the first seconds of Sultans of swing I found the Denon to be more live, more bold, more into the headphones. The Fiio is...I do not know if lower in volume, maybe not, but maybe with less dynamics? I listened to Fiio and I said it sounds so good, but when I switched to Denon it sounded better, it hit me harder with the sound. I switched the cds between players, maybe it was the recording's fault, same result. Denon more punchy, Mark Knopfler's voice was deeper...
The drive is slower than the Denon, I did not measure the time to read the CD when loading, and it makes a mrrrrrr when stopping. It does not like any usb c cable in it, I had an Ikea one and I had to switch the ends because it was losing power as I took it in the hand to press buttons - those are really small. I used it in desktop mode, antiskipping off.
And some strange behavior...sometimes it does not "lock" with the Dac coax output? I have a text appearing on the Topping DX9 display when nothing is connected to coax - UNLOCK. When it sees the connection and when playing, it switches to 44.1KHz. Sometimes, 44.1 appears but there is no sound, I have to restart the player. This happened twice when I left it on the desk for 10 minutes, as I was writing this text. I changed the cables between Denon and Fiio to be sure it is not the cable, even if it is a Fiio cable

) Strange. Maybe an update will fix it.
So, to draw a conclusion, I like the format, it would have saved me some space on the desk, but sonically for me I feel it like a downgrade from the Denon. I do not know how it measures, but if I keep it, I will still use the Denon for its sound :|
Unfortunately, it will go back tomorrow...
Some pictures below...
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