Look, I'm no shill, but I went from the sony xm4s to the qc ultra and the experience is much more refined. The sound is classic Bose, very crisp and balanced. But you've always got the eq if you wanna cosplay the headphones as beats by dre. The noise cancellation is nothing less than incredible. I mean I know that's their whole shtick, but the first time you use quiet mode, it blows other over ear and headphones out of the water. The only downside is that they're not the most secure headphones. In fairness I'm not a runner, so this doesn't bother me at all. But obviously they've traded grip for comfort. I'd take the same trade imo, but that's me. For the average user who values great anc, these are the holy grail.
The Bose QuietComfort Ultra Headphones are very comfortable and crystal clear. I bought the headphones because I work in a noisy environment and I need to be able to hear and understand what is being said while on the telephone. On top of that I am hard of hearing and wear hearing aids. So I wear the headphones over my hearing aids and it's not a problem. I do not get any interference between the two devices and they actually work well together. I am now able to filter out the noisy background and clearly hear what is being said over the phone and to my surprise the person I'm talking to can clearly hear me! SUPER AWESOME HEADPHONES!
I work in cubicle city, so focusing at work was difficult. I count these headphones among the best purchases I have ever made. When I have them on and playing white noise, I hear nothing going on around me-- almost like I am in my own private office.
I believe that the product is good, the active noise canceling is great, Spatial Audio is awesome. The only concerns I have is the price, I feel as if it can be significantly decreased.