Sleek design, comfortable cups more spacious than the HD series and of course the signature Sennheiser sound which means balanced sound, crystal-clear vocals, and punchy bass. With Aptx HD encoding that supports 48khz and 24 bit rate, the sound comes through clear and high quality; you will hear melodies in songs that you have listened to 100 times that you wouldn’t have caught before. Good sound imaging, meaning in orchestral music/instrumental you can pinpoint the positions of the instruments. They remind a lot of the 350BT but the Accentum have a fuller/warm sound. The ANC is quite decent but not top-notch (you will still hear in the background the screeching of the metro rails in Athens). The touch controls have lightning-fast response and you get used to them within the first 10 movements. Their purchase at 150 euros was worth it and then some.