I listen with the M920 and M8 exclusively on headphones. I have multiple computer systems, so I swap around sometimes. Sennheiser HD 800, Beyerdynamic DT 990 600 ohm, AKG K7XX, AKG K553 Pro, Sennheiser 598 SE, Shure 535, IEM, etc. I have too many headphones/earphones that I need to get rid of, but I'd be too sad to see them go! I would say, pair the M8 with something like the AKG K7XX and an Objective 2 headphone amp, and you've got yourself something that only a M920 with a HD800 trumps, but also costs almost $2350 more. This is a no-brainer mid-high level audiophile setup. From experience, going from mid-high to high level audiophile setups aren't worth the few extra thousand you end up paying for. Yeah, some things sound better, but unless you're recording music as well as listening to the end results, you won't notice many differences. Remember, tastes vary, so if you don't like the M8, try a different headphone that compensates, or try other DAC's.