This is an early review as I have only used the headphones a dozen times. The longest session was a good 4 hours.
I bought these headphones for the price, the brand, and the characteristics. I am not disappointed in the least at this point. The noise cancelling is very good and so is the Hear-through. They are very comfortable and do not get too hot around the ears.
The sound quality is quite good for BT headphones, very clear and defined without lacking bass. They seem very well constructed, feel solid, and do not have a plasticky smell.
If I really have to find a con, I guess the headband cushion could be a tad thicker even though it is quite comfortable as it is.
Time will tell how well they hold but, at this point, I really love them and I do not expect bad surprises given the quality.