I had the opportunity to listen to the DAC 25.2 at a local dealer yesterday. The CD player was a NAD 542 which I thought might be somewhat similar to my own CD player. I listened through Sennheiser HD 595's.
This is the first higher-end DAC I've listened to. The three upsampling settings made dramatic differences in the sound--I liked 96 the best as this seemed to make the music (classical) sound right to my ears.
All the settings produced a very large soundstage. I would say that the headphone amp is very good. Oddly, I felt at times that the sound might be a bit dark, but it still was detailed and spacious, quite musical.
This is, of course, to my ears. Next weekend I will bring the DAC home for an audition and get to know it better. The price, at $595, would be a worthwhile investment if the DAC lives up to its potential. I would consider it a keeper if the audition works out and pleases the ear(s). Keep in mind that I am 56 years old so I don't have the money to play around with audio purchases. I just want to sit down, relax and enjoy music.