Re: Bose QC 35 ii firmware 4.5.2
A few hundred people have had issues with firmware updates. It's not clear yet if it's the firmware... or the update process itself. But hundreds of thousands of users have absolutely perfect ANC with these headsets. I'm one of the happy campers. My suggestion: buy them. They are the best available. I compared to the Sonys when I found this thread... But the Sonys are not as good.
Bose support is amazing. Get the headsets. If a firmware update (unlikely) botches your headset, just take it back to the store and they will replace it. But if you are like me... your headsets will provide years of beautiful service.
One thing... Older headsets had ANC set to a level where you almost heard nothing from the outside world... and if felt like your hears were in a cotton box. Some loved it. I found it too much. The newer generations have ANC set to less strong. You still hear people speak. It's a security feature. If somebody in the office screams "fire!" you want to hear that... On planes, the ANC is really great. Wind and engine noise almost totally gone. Most people voices barely audible. And audio quality is perfect. The previous ones, audio was slightly colored and not as much to my taste.
What I think Bose should do is instead of 3 levels of ANC (0, low, high) they should have 4 levels (0, low, high, and full isolation). That would make everybody happy.
But today, I am VERY happy with my QC 35II (latest 4.5.2 firmware).