Pros: Wonderful, cohesive sound with great soundstage.
The HD800 is the finest headphone sound that I have ever had the pleasure of hearing. I put over 100 hours on them before giving them a serious go. Over the past week I have listened to a wide variety of music on them, from jazz and classical to rock and country with a little blues thrown in when the mood struck. The Senns reward great recordings with terrific detail, sparkling treble, rich full mid-range and a solid bass foundation. They do not add or subtract anything from the recordings, they are very neutral and natural sounding. I have paired them with several amps, including the Schiit Vahalla and Asgard, but they shine with the Burson HA-160.
On good jazz recordings you can clearly hear each individual instrument. The acoustic bass sounds very deep and detailed. Pianos sound realistic with a profound sense of the body of the instrument on display. Drums kick hard and resonate. Guitars are stunning, both electric and acoustic. The high hats are clear but never harsh or in your face. On orchestral music, the sound captures the full sweep and beauty of the orchestra. Rock and country sound great, and a well recorded blues disc puts you there. In particular I was struck listening to the Beatles remastered discs, as well as several remastered Elvis Presley cd's from the 60's and 70's. Today I rocked hard with the latest cd from Tom Petty, MOJO, which had all the right stuff going on. Vocals, both male and female sound superb.
In summing up the HD800, I only have the strongest praise for this marvelous piece of headphone engineering and would strongly recommend them to anyone considering them.
I also paired my AKG 702's with the Burson and that combo was also stunning. But the Senns truly shine.