They have terrific build quality, and are very comfortable to wear. The headphones rest lightly, and the felt pads are soft and comforting. Sound quality is terrific, and you will most likely need a DAC to take full advantage of it, but it works great even without it. https://www.amazon.com/SENNHEISER-660S2-Audiophile-Headphones-Transducer/dp/B0BRT1ZN7Q
Are you kidding me! $ 379 on sennheiser site for next 2 days.
Also same price on amazon via prime sale. Do yourself a favor and get directly from sennheiser. Amazon is a return paradise and no guarantee you are getting an unused item.
Glad I got mine for $399 on the Black Friday sale of Amazon. Good headphones, more clearer than the hd6xx although in some recordings the highs can be a bit too much emphasized. But overall the highs are better defined and present on the 660s2 compared to the hd6xx. Overall I enjoy the 660sv2 more.