Hi, I'm looking to purchase Beats Studio 2.0. Wireless I currently have Beats Mixr and I wanted to know what are your opinions on the Beats Studio 2.0 Wireless: the sound quality and their battery life. And also if it's worth buying them for someone who has Beats Mixr. I also wanted to know if on the iPhone (6 Plus) the battery was draining quickly while listening to music with the Studio 2.0 Wireless. Thanks!