Despite some horrible reviews I have read over multiple site, I decide to give this a try solely for the 15H battery life and Audio Technica brand name. So far, I am happy with my purchase solely for the sound quality and the bass but just a bit lacking in treble, imo. It is almost on par with my reference buds Sony WF-1000M3. For my personal bass preferences, it sounds better than Jabra Elite 75t, JBL Live 300 and AKG N400. At $80, definitely not disappointed and plan to buy a second pair if it survives pass the 30 days returns period. I will not be able to testify 15H battery claim and have to take manufacture words for it.So far:- Able to listen to music on my iPhone XS max from 20 feet away through wall without lagging or dropping.- No humming, static or ticking noise when pausing or playing. Maybe these issues have been ironed out and addressed in firmware update.- Very good quality material, finish and workmanship for the price. Definitely better than the plasticky JBL but not as high end as AKG, Jabra and Sony.- Passive noise cancelling is good, not as good as Jabra but better than AKG and JBL. It's a good thing as I can still hear some attenuate incoming traffic when bicycling.A few trade off for the 15H battery life and 10mm driver:- Large, not pocketable friendly case (pictures left to righ, Jabra Elite 75t, AKG N400NC TWS, JBL Live 300, Sony WF-1000M3, Audio Technica ATH-CKS5TWBK)- Bulky earbuds. They stick out a bit more of the earlobe and a bit bigger than AKG and JBL but not as bad as Sony as I experience less wind noise when walking, bicycling in windy days. The Sony wind noise is so intolerable that I can only use it inside or absolute calm day outside.Ran into some issues but able to resolve.- Some discomfort of the 3D loop on the righ earbud after 45 minutes of wearing. However, after twisting and resitting the bud the discomfort disappears.- The left earbud drop off completely when I first receive it. After a convoluted and complicated way of firmware update, the problem is solved.Don't like:- Lengthy, complicated and convoluted ways to upgrade firmware by following the on screen prompt. It is so complicated that I may not remember the exact order. + Both earbuds in the case + Click on left earbud button three times until the white LED blinking. I try several time to make this work. + Take the left earbud off the case. + At some point I have to connect to special Bluetooth reserve mode. + The firmware start to update. + Once complete, repeat some similar steps for the right earbuds except I don't need to click on the right earbud button this time. + From this point on, the instructions are vague and the white LED doesn't blink as expected. Consequently, I have to fiddle around to make it work by a miracle. I hope that I don't have to do this for the rest of its lifetime as I have absolutely no recollection of what and how I get there.- Case is fingerprint magnet.