I am seriously enjoying these headphones! It required a few days to acclimate/burn in, aided by an aftermarket cable upgrade. Very, very nice sound in a comfortable and lightweight product. Maybe better than my HD 580, although I don't have them in hand. They are an interesting phone to have along with HiFiMan Sundaras. Very happy to have not paid new list price!

The quality of these headphones meet my standards because the sound is great and clear, the bass is crisp, and the overall physical appearance of the headphones is aesthetically pleasing. Please note, these headphones are NOT noise canceling. I researched them before I bought them.

Sound quality and noise cancelling far exceeded my expectations at this price point. They barely fit over my ears which is okay, at least they aren't crushing my ears. The microphone works decently. Battery life on them is great, I can get around 20 hours from them at my normal volume levels. However, the reporting of battery % is awful. It stays at 100% for what seems like hours then drops down to 60%. It originally would say, "low battery please charge" when it got low enough, now I just get "Power off" and they just poof. So instead of charging them when needed I am plugging them in every night so they don't die with no notice, last nights power off was reported at 60% since I had just checked the battery before they died, 10% when powered back on.

These are the best headphones ever. They arrived early and in amazing and condition. The sound quality is the best I've ever had. Thanks back market for the best birthday ever.

best headphones i have ever had. came in at brand new quality. i would trust backdoor with my life. i got these almost a year and a half ago and they are still perfect

Followed steps from Sennheiser video hooked right up. Sounds great for streaming content although Music in movies is much louder than dialogue.

They came in box with all accessories and instructions. not a scratch in sight and the sound quality is unmatched.

Bought these for my wife, who was smaller than usual ears. this prevents her from using earbuds. She loves them, and she also says the sound quality is great.

cord is so so so long and i need 2 adapters just to pair it with my phone and i regret nothing they sound fantastic and they arrived incredibly well packaged for safety