Very nice, this N90Q. Pairing with the Sony WM1Z at the moment. The 3 spatial modes are not really that different. Very subtle even going from standard to surround. Although there were moments when I heard sounds from farther parts of my room. Uncanny. I did wish AKG made the spatial selection button indicate which of the 3 settings we're in. The fit is comfy. The case, the leather bag and the leather pouch for the battery were all top notch. Quite superior compared with other cans in the $1000 to $4000 range. The cables seemed out of place for the system. I like the lowest tone setting with the surround (i think it's surround...) This combo is rather soothing with jazz. Any burn in needed for this baby?