Hugo was a bit of a disappointment at first for me. Compared to the Mojo it was hard, fatiguing, lean and the only aspect it was preferable in was a promise of slightly more detail. That was with Audirvana (all system optimizer stuff engaged) out of a MBP or an iMac via straight USB. I'm waiting for a decent mobile source out of China but in the meanwhile I got a little iDefender 3.0 from ifi and what a difference it made with the Hugo. I would have to assume it's more sensitive to USB noise than the Mojo because the Mojo got 10% better and the Hugo 100% better and left the Mojo firmly behind. Now it's not hard or harsh or 'analytical', it's just more open with better extension and detail both ways and better separation of sound elements. Some say the difference between the two units is mainly in the treble but I disagree, in some songs the bass line is right there throughout with texture and all with the Hugo while a direct switch to Mojo has it gone hiding a bit. Low level detail such as room ambience, cymbal decay and reverb tails are the best I've heard from any unit I've owned, I hope that will improve further once I get my Xduoo X10T II. It was a bit of a bargain at £350, I think the previous owner perhaps was a bit worried due to having used it plugged in for a year and then stored it with the battery dead for a couple, but it seems to hold a 9 hour charge or so and I hope to keep it alive and well for a few years, with Chord's help if need be. The power switch gives me a sarcastic laugh at times when it proves hard to fiddle with with the USB plugged in, as well as needing to look at the unit from a certain angle to gauge battery status, but other than that I'm very very happy.