I took a chance on some HD800S and I tried them first with the Mjolnir 1 while BW shipping was a day out. A clear and smooth sound, little harsh in some way -some coarseness- like a a pair of quality leather shoes but disappointing polish; nice headphones I thought. Couldn't articulate until I heard the Black Widow. The treble seems sharper on the BW but the musical presentation and textures felt natural (organic?) like I was listening to speakers that weren't there, not headphones. I am impressed. Still 800S bass hits like a MMA lightweight fighter with KO power, yet still a lightweight -I can live with that. This amp is a keeper and it made the 800s a keeper too. Gungnir Multibit in flight!