The sound quality is all-around and doesn't cause listening fatigue. It has a good balance of clear, open-sounding highs and crisp lows, typical of open-back headphones. I think the sound quality is comparable to the HD598/599. The fit is light, and the velour pads provide a comfortable feel. I purchased it used about a year ago and used it 2-3 times a month. Recently, the frequency of use has decreased, so I've decided to sell it to declutter. It has a high rating of 4.37 on price comparison sites. ■About the product ・Operation confirmed. Both left and right sides have no sound issues. ・The housing has some minor scratches, but there are no noticeable scratches and it looks clean. ・The ear pads and head pad are in good condition. 　I think you can use them as is. ・Detachable cable, 300cm straight cable (standard plug) ・Accessories: Standard/mini conversion plug ■Shipping ・Shipping via Takkyubin (Yamato Transport) 60 size. ・Shipping costs are covered by me. - Brand: Sennheiser - Model: HD 559 - Type: Over-ear - Connection type: Wired - Cable: Removable cable Thank you for viewing.