Sobrepasaron mis expectativas, cargan muy rápido y la batería dura muchas horas. now that 2 are bad I will replace else were. Not aero dynamic, but the vehicle these will go on to is probably not concerned about that. The leather quality is completely awful compared to before. Easy to assemble, comfortable and roomy for shoes. It has an ANC/HearThrough button that is useful. ? Which is extremely disappointing because I love to pair these up with some fuzzy socks on colder day?s but the sizing makes it impossible even with a thin & lightweight sock. JBL App========================-The app works great for me. 0 devices cause interference. And thats just for heavy storage.