I've owned both the qc25 and the qc35. The qc35 are superior by leaps and bounds for my usage. The wireless is incredible. That feature alone is worth an additional $200 to me. I think it's rather crazy to get the wired version. Keep in mind that the 35s come with a wire which doubles your battery time to 40 hours. I can't imagine needing to use these headphones for 40 hours without having an opportunity to charge.