I was mainly tossing up between these and the Sony 1000X M2 for a while. I looked at a lot of different brands and reviews and the what made purchase the Bose in the end is their sheer comfort and quality.
As someone who would get a lot of ear and head fatigue to the point of extreme discomfort, this was my number one priority. These headphones are by far the most comfortable pair I have ever tried - I can wear them all day without any signs of discomfort, in fact they make great ear muffs in winter! The build quality is also excellent. They feel very premium and sturdy unlike others at this price point like the Sony's which definitely feel more fragile. They are also noticably light weight.
Their noise cancelling is also far superior to any other pair on the market. It's like being sucked into a vaccum - albeit it would be nice if there were as many options as there are on the Sonys.
Finally in terms of audio quality I really have no complaints. They sound brilliant. What's important to keep in mind is the device outputting the sound. These are a force to be reckoned with when connected to my MacBook Pro with an audio enhancer running, while they are far more subdued when running Spotify on my Galaxy S8. There are better sounding alternatives out there at this price point, but unless you're an audiophile the difference is marginal, and again a lot of what you notice will depend on the quality of audio you output.
Also, as a bonus, pairing to two devices is really handy, as for Google assistant, haven't really used it much but it works well if you're into that thing - same goes for phone calls.
I was a bit apprehensive about spending this much on headphones, but if they're within your budget you really won't have any regrets.
How do you make the best headphones from Bose even better? You give people access to voice control with the simple push of a button. QuietComfort 35 wireless headphones II are now Alexa-enabled. So not only do you enjoy the world-class noise cancellation and acoustic excellence Bose is known for, you also have the ability to play music, get information and so much more. Just download the Amazon Alexa app and follow the instructions to set up and pair your device. Then hit the Action button and say the word. Plus, you’ll be free from wires with easy Bluetooth pairing and voice prompts to walk you through every step of the process. Or connect to your device using NFC or the Bose Connect app. Premium materials add durability and make for a comfortable fit. And up to 20 hours of battery life from a rechargeable lithium-ion battery will let you keep the music playing all day—or flight, train ride, study session—long. There’s also the power of choice among three levels of noise cancellation. Use the settings in the free Bose Connect app to choose your preferred level of noise cancellation and completely block out the world around you, or let in some noise to remain aware of your surroundings. Available in Black or Silver. Included: QC35 headphones II, carrying case, charging cable, audio cable for enjoying music without battery power.