The Hugo is not only extremely poor value for what you get, it is also just not a very refined product for the demanding HD800.
I'm definitely in line with this opinion.
Interesting comments, while my own search for a new dac continues personally I am not a fan of the Hugo's aesthetics or connectivity options however there is undeniably a lot of info online about it perhaps more comparisons with other dacs than any other. Because of this it had crossed my mind to purchase a used one to try temporarily and get some kind of bench mark to work off for a significant purchase. Used Hugos in the UK are relatively easy to come by with one of two turning up each week on UK forum's for around £800 used or at the moment £990 for a one month old store demo one with case and (full warranty) moving on and reselling would be painless.
The Other dac which looks interesting and is reasonably easy to find is the NAD M51 for around £650-£750 for a mint one £900 new (if you haggle). Again lots of reviews on comparisons with others. I am kicking myself as a Auralic Vega was available a few days ago and I was to hesitant about pulling the trigger at £1300 it sold within a few hours.