I am very happy with the fit. I think the stability bands were a great idea and make what is a fairly bulky device far more stable than I would have expected. I was also pleasantly surprised by the noise cancellation, it's still not as effective as the noise cancellation of my 4+ year old Bose 700s, but it does work in some specific use cases while still letting in some annoying frequencies (even after running a successful seal test). If you're a smaller person with small ears (I'm 5'9" with fairly average ears from what I can tell) I do not believe these will work for you. I fear these may have been subject to the common failure of western designers using QA testers who tend towards the average american male traits.

The software customization is very disappointing. No matter what I try, switching modes is always accompanied with the robot voice saying what setting it is now in even when you only have 2 distinctly different, easily recognizable modes that are self evident without the interruption. What makes it worse is that it will sometimes accept my input, return the robot voice saying I'm in "aware" mode (for example) but the mode settings are still in "quiet" mode until I resubmit the input and the robot repeats the same mode as the change is actually made to the mode setting. I've also had issues with earbuds not knowing the difference between being in my ears or set on the table and continuing to play audio in the background when I'm expecting it to be paused based on the manual.

The most disappointing element is the poor quality build of the case. The case is essential to the product, the earbuds are useless without it, so the attention to detail should still be there for such an integral element of the product. Difficulties taking out the earbuds with long nails is something I can understand being missed during QA tests, but the hinge of the case is poorly designed and executed to a shocking degree. It's immensely wobbly when closed and feels like it could break with a single drop at the wrong angle. These Bose buds are $50 more expensive than the current high-end earbud "standard" (the ones that are optimized for iOS exclusively) which, in contrast, has the best executed earbud case I've seen so far: the hinge is actually made of a material that is up to the task of functioning as a robust hinge at a small scale with high use.

After the impeccable experience I had with the Bose 700 headphones (which I would give 4/5 because they're, once again, not good for small heads), I was expecting a comparable degree of build quality, and that may have been my own mistake. I'll be keeping them, they're functional earbuds with the expected Bose audio fidelity, but it is a very disappointing build quality that I am simply hoping won't lead to these becoming e-waste due to a bad drop or the hinge just giving up what little it had to give it begin with (although I imagine I could return them to be refurbished if that sad future would ever come to pass, which is of come comfort).

I waited over a month before writing this review since I only review purchases after I get a good amount of use of them and since it's been almost 2 months let's do this.
Ok everyone has heard of Bose and many have heard of their sound quality and outside sound canceling technology but let me tell you that until you experience these things you just don't know how hood they truly are.
I've always kinda liked Bose and I've owned a few of their products off and on over the decades but wow oh wow are these great earbuds, the sound quality is excellent and the app super easy to operate giving you a lot of control over your person sound experience using these earbuds.
The crisp clear beautiful sound is just so dang sweet and are great to listen to podcasts but when you go to music is when they really shine and will make you smile.
Now let's talk about the sound canceling on these Bose earbuds as it is a-freaking-mazing and I was unprepared for just how much they block when you turn on "Quiet" mode on the app, everything fades out and you are alone with whatever you are listening too which makes the uninterrupted voices/music even better.
Last is the fit, these earbuds will not fall out or shift in your ear and I found the mounting seal not only unique but very comfortable. I have worn these earbuds for 2-3 hours at a time and never did my ears feel any fatigue during or after as I've experienced on other in ear headphones and earbuds.
The one tiny downside of my earbuds is that when watching my TV in front of my treadmill the earbuds dont have much volune and i havent found how i can take conttol if the volume of the actual buds whike connected to the tv unit but this is a small issue really as
I rarely use headphones on my treadmill.
The bottom line is I'm thoroughly happy with my Bose earbuds and enjoy using them as they seem to have given new life to my music and workouts.
I will definitely keep my eye out for more Bose products in the future when shopping for audio products.

I recieved these incredible Bose QuietComfort Ultra Earbuds and I couldn’t be happier with my purchase! I purchased them through the Insiders as a product review campaign. I had been looking for new ear buds for quite some time, as I have trouble finding ones that are comfortable for my small ears and have a long battery life. As a nanny and home manager, I frequently want use earbuds during the day when not with children but cleaning, etc. These Bose QuietComfort Ultra Earbuds have proven to be even better than I expected. They have multiple different earpiece tips so I could select ones that fit my ear. They also have a “stabilization” loop (in different sizes!) which helps the buds feel secure and comfortable!
I think my favorite feature of these Bose QuietComfort Ultra Earbuds is the ability to change sound modes. Just by tapping on one of the ear buds, I can change the immersive audio from “quite” (aka full noise cancelling - and it truly is!!!) to “aware”, which lets me hear whatever I’m listening to through the earbuds, and also hear my surrounding environment clearly enough to be quite literally AWARE of what’s going on! I’ve found this feature perfect for if I’m washing dishes or cleaning at work while a baby is sleeping, and I want to listen for any sounds on the baby monitor or heaven forbid (if you’re a parent or caregiver, you’ll understand this) - a knock on the door or the dog barking 😂
I have integrated these earbuds into my daily life, using them to take video meetings, watch tv, listen to music and also practice daily meditations at nighttime without interference of the noisy world around me.

I've been using these for 2 weeks now. Had to replace my lost Bose QuietComfort earbuds which I've had for 2 years. Noise cancellations is superb to all other brands I've tried, but the updated design doesn't work so great. The wingtip of the old model was more secure in my ears (I guess it's me, all other earbuds fall out with the slightest move too). I have requested the additional sizing bands, hope the XL will help. The updated expanded app options are also nice, first thing I did was lower the bass. And the connectivity to multiple devices at once is also a welcome improvement! The size of the buds and the case is still a minus, they're big compared to say airpods or samsung, but the superior ANC is worth it to me. Half the time I wear the buds with nothing playing, just to tune out background, office, airplane, snoring noises. I'm taking away 1 star for the less secure fit, XL bands not coming stock, and another star deduction for the startup sound - it's obnoxious, loud and shriek-y, as if something is wrong with the speaker? Also, the responsiveness of the touch controls is a little off, I find myself accidentally hanging up (double tap) instead of answering phone calls (one tap). Still on the fence about background noise filtering while on a call, have to ask for more feedback. So far I've heard a few complaints about my background noise on calls, so I'm tempted to say the older model was better (would filter out barking dog like a charm). The 6 hour battery life leave room for improvement, a flight to Europe takes 8-10 hours! And when I wear them to sleep and not be woken up by snoring, I'd like to sleep longer than 6 hrs... Overall I am die-hard fan of Bose's ANC, but for the price tag I would expect perfection in other areas as well.