Anyone Heard the GoldenSound Edition Ferrum Wandla DAC with Tube Emulation?

I've been researching DACs and came across this intriguing (to me) Golden Sound Edition Ferrum Wandla, which, among other things, adds a tube emulation feature to the standard version:

https://goldensound.audio/2024/03/03/ferrum-wandla-goldensound-edition/

I don't recall having heard of anything like this before: 

The WANDLA Golden Sound Edition features a tube mode, which intentionally increases the even-order harmonic distortion produced by the DAC, similar to the distortion added by a tube amplifier. This allows the user to enjoy a warmer, richer sound without directly changing frequency response, and without the other drawbacks commonly found in tube based devices such as increased noise.