I love the headphones themselves, they are everything you expect from Sennheiser. They look good, the build quality is top-notch, great sound, strong bass, and absolutely amazing battery life. There are two things that I do not care for though and both of which are on the software side. The first is the app, while not bad it's not great either, is kinda slow and a little clunky but it does do everything that it should and is user-friendly. The other thing is the lack of customization when it comes to the touch controls on the ear cups, it's only on the right ear cup and you can't change what each input does.
Very good headphones for work, noise canceling and great sound quality even at low volume. For some people these are good enough to be your main headphones. Very good battery life.
I've been using mine for several weeks now and quite impressed with it's 50-60 hours of battery life, sounds one of the best heard from bluetooth headphones. The details and bass are great. I've had Sony wh-1000xm4 headphones for a while prior to this and glad that I bought this to replace it.
I've been wearing these for a week or so at the office/home and have thoroughly enjoyed them. Comfortable for hours, unbelievable 50-60 hours battery life, and is very efficient connecting to two devices simultaneously. Music, mostly 70's rock, sounds great. I assume that the B&W Px7s2/Px8 and the Focal Barthys sound better but only with a huge price jump. Great sounding, comfortable, great touch controls, easy to use and a great buy!