Opinion on audio note kit dac 5.1 or 4.1

Hi Guys

Happened to chance upon a audio note kits dac, and their dac 4.1 and 5.1 looks really interesting!
Have never heard them in person before, but their specifications look pretty good!
Have any of you heard them before, and what kind of sound characteristics do they impart? (in terms of sound stage, musicality/sweetness, smoothness, warmth/brightness etc)
What system do you play them in and how would you compare them with other dacs you have owned?

Thanks!