Well, I am actually blown away by the quality of these headphones. The only noise-canceling headphones I've ever tried are the super expensive Bose ones and I really feel like these Boltune headphones give them a run for their money.
Sound quality & bass handling: The ability to handle deep bass is very important to me in headphones. I listen to a lot of bass-heavy electronic music and that's usually my first test when trying new headphones. These headphones handle bass perfectly. I'm very happy with the all-around sound quality.
Noise cancellation: This is where I thought the Boltune headphones would be subpar in comparison with other headphones I am familiar with, but I was wrong! Without putting any music on and just flipping back and forth turning noise cancellation on and off there is an incredibly noticeable difference. The headphones do a GREAT job of reducing low and mid-range frequencies. I'm also very surprised and satisfied with the job they do here.
Bluetooth & Aux: Paring the headphones with my phone took about 2 seconds. All I had to do out of the box was turn the headphones on and connect with my phone and I was instantly able to start listening to music. Something I'm very happy to have is the ability to plug in an aux cord. I am a music producer and DJ and I will be using these headphones in my studio with gear that is not Bluetooth enabled and at gigs. The ability to use a cable paired with the noise-cancellation is incredible!
In the box: The headphones came with an aux cable, a USB charging cable, and this adapter which I've actually never seen before and am not entirely sure what it is used for. It was nice that the whole package includes everything you need to listen!
Overall I'm super satisfied with these headphones. I have them on right now as I write this review, listening to deep dubstep and chillstep and it sounds perfect. I definitely recommend them for anyone looking for amazing quality at an affordable price.