I reviewed an Auteur and had an Eikon with the Kenzie and Amethyst Zach loaned me.
Quite a few people like the timbre and character the Kenzie has. I'm not sure if it was the combination of the Amethyst and the Kenzie, but I found the Kenzie sounded a bit too...thick, didn't have much separation, and had a bit of bloat. That was with the 32 ohm...the 300 ohm made it way too much. (I should also note, the 32 ohm and 300 ohm outputs are the actual output's impedance, not "what headphone impedance should go in this output.")
A lot of people love it though, but I didn't. I prefer the IHA-1, ZDS, and Black Widow 2 with the Auteur and Eikon. I'm sure the Kenzie doesn't sound as thick with a neutral or slightly bright dac, but the Amethyst, being warm and a bit dark, wasn't a good combination for my tastes. I will preface that with a "but that's an unpopular opinion in this and the Auteur thread."