Well, I haven’t even tried to A/B the D90 vs Biftost2 yet, my initial impression is I really like the D90 and I am enjoying listening to my desktop setup again with my THX amp vs my old SU8. So much so that I thought I needed to sell the THX amp and get something different, and as of right now I don’t feel that way. It is funny how other places say you can’t hear a difference between DAC’s and as long as they measure well nothing else matters. That unfortunately to me is a load of BS.
I honestly doubt I will take the time to go through my playlist and A/B them 3-4 times, it’s really not worth it. They both sound terrific, and I am sure everyone may prefer one to another and I am just happy I now have both! They both sound terrific, and I think someone trying to decide should base the decision off of esthetics, features, brand confidence, warranty or possible sales price. That is my 2cents!