Ypsilon DAC anyone?

Does anyone have any experience of the above? I’m a 500/552/NDS owner and am possibly setting up a second system. I heard the Ypsilon integrated and was impressed. Have a chance to pick up a used Ypsilon DAC (first gen not the brand new one) as a possible pairing, and was looking for any feedback. 

Would also be interested in the front end components feeding the DAC ... was thinking of possibly using my existing NDS  

Thanks!