Okay, I was a pure Bose naysayer.
Purchased the QC 15's a few years back, and over the course of those years realized that the audio quality wasn't up to par and the build quality was very lackluster for the premium price. Also was a big naysayer of bluetooth, with inferior audio quality, the need to charge the headphones AND the notorious pairing process. I'm not a marketing spokesperson for them, nor am I an audiophile...
However, I did receive the QC 35's as a present around a month ago and I have been traveling a lot with them recently this summer. And I must honestly say, that they are fantastic. The convenience of being cable free alone is worth it in my books. I only have to charge them 1 - 2 times a week for about 2 hours, and I use them daily for many hours for music, movies, etc. The best part in my opinion is how they've fixed the pairing issue, the companion app remembers the last paired devices, and you can manually switch on which ones to pair to instantly.
Also it simultaneously stays connected to two devices, usually my iPhone and MacBook Pro, and can therefore playback audio on one after the other seamlessly without doing anything. Switching them on also makes it pair instantly without hassle, which made me realize that it's even more convenient than plugging in a wired-pair of headphones from one device to another. Two smaller things to note is that you can rename them to your liking and also set exactly when you want them to go to sleep to save battery, so most aspects have been well thought out. The audio quality is great, the cans are very comfortable and the battery life is great, even though it is very pricey.
The technology will only get better and cheaper within time, with Bluetooth 5.0 being announced and AptX HD on its way to improve range and quality, this is truly the future in my humble opinion.
RIP 3.5mm headphone jack, good riddance.
PS: I was also eyeing the B&O's H7's, in the future perhaps because the battery is interchangeable.