Nice! I've had the HD820 for a couple weeks now and one thing I think is universally true is that the fit and seal of the ear pads have a tremendous affect on sound. Some of this is true for any headphone like where the drivers are centered relative to your ear canals. However, the HD820 pads are more challenging to fit than most headphones IMHO. If you look at the design and materials, it's clear that you need a good seal, but not "air tight" seal. The most obvious issue is lack of seal which make the HD820 have a very nasal tone with no low end. However, if the seal is too tight, then the HD820 sounds boomy and muddy from low end through the mids. You can hear this effect by pressing slightly on the cups while listening. IMHO, 80-90% seal is ideal. Lastly, it seems that the seal gets better after wearing the pads for 10-15 min. Maybe there is memory foam? If true, those who try these for a brief period of time at shows will find it very difficult for a proper seal. Should a headphone be this sensitive to pad placement and seal? Ideally no, but somehow I think precision will be compromised if there is more generous play. After a couple weeks, I think I know optimal fit now just by how the pads feel on my head.