Thanks uncola. Logged just 3 hours of listening as of today. Haven't tried it with different setups yet but will try it over this weekend. So far... IT IS GOOD out of the HD800. Very musical and definitely no loss of detail. Very VERY good extension on the low frequencies. Highs are somewhat rolled-off but will try to reassess it as the days go by and with other setup. Tried it with my OTL tube amp (LDmkii on voskhods and russian power tubes) and it sounds AMAZING. The music is so pleasing to my ears. It made my HD800 un-analytical (in a good way) and made me just listen to the music. I noticed that on good recordings (mastering) and on jazz/alternative/bossa, that this NOS dac really shines. It brings out almost all if not, all the details in the recordings and instruments sounds just right. So this is it for now after 3 hours of listening. I can say that I'm already loving this dac! Sounds better (musical) than the cirrus dac of my ak100ii (to my ears). Next up for me would be to hook this up to the upcoming LC and try to compare its output from different amps as well (SS vs Tube Valve w/o opamp). Will try to use planars later (LCD2f/alpha dogs/hifiman) and see what it brings. p.s. May i ask what is your main dac? Cheers!