They have incredible sound quality for their size and their volume is very good for my needs. They also have very good build quality, both the headphones and the charging case. Additionally, they have very good noise cancellation for in-ear headphones, especially when listening to music at over 70% volume, you don't notice many external noises. Of course, the noise cancellation cannot be compared to other over-ear headphones that are more expensive and much larger, but I believe it is satisfactory for most situations.
The app has options to automatically switch between noise cancellation and ambient mode depending on whether you are moving, sitting, or in a transportation mode, but you can also completely disable it and choose manually. It also has an equalizer, but most of the time I have it off because it significantly reduces the volume in the preset options, and most of the time I only adjust the equalizer on my mobile device.
You can select pause, next, or previous song from the right earphone. Additionally, the left earphone controls the noise cancellation, ambient sound, or deactivation of both. The only negative aspect is that the volume cannot be adjusted directly from the headphones, only through the volume buttons on the mobile device.
Overall, I am satisfied with my purchase for the 3 months that I have had and used them, even more than other over-ear headphones that I have, despite having better sound quality, because they are much lighter and you can have them with you all day and everywhere. I believe they are the most practical headphones I have ever had in terms of sound quality, and I would buy them again if needed.