Ok, here is some my 2c. I own them for about 1y and use very rarely, the main reasons:
* I can't hear any noise-isolation
* Battery can hardly survive for 3-4 hour, and they can't be used while charged
* BT antenna is VERY low sensitive. Literally I can't put my nexus 5x in my back pack or in jeans pocket, as sound became breaking
* Crappy build of buttons, my power on/off button breaks after 2 month
* Power on diode is way too bright for night listening
* Awful and loud sound on successful pairing
They cheap, but miles away from any other BT headphones I have. What is worse, is that none of described problems was in the lot description, while most of them can be easily found in 10 min.