After trying Bose QC35II, Sony WH-1000MX3 and Bowers and Wilkins PX headphones I ended up buying Bang & Olufsen H9I. The sound quality is 100 times better, it's like hearing your favorite songs for the first time. Listening to Rolling Stones 'Beast of Burden" I can hear every note Keith Richards and Ronnie Wood are playing, it's incredible! The noise cancellation is really good. I used these while using a chain saw and they worked great. Very comfortable. They don't quite get as loud as the B&W PX but when wired to a device they are just as loud.I thought this may be a deal breaker but after listening to these for a couple days the volume is perfect and if you have that urge to rattle your ear drums you can always wire them to your device. I find myself listening my Beoplay H9I almost everyday!