Admittedly, I'm not a fan of closed back headphones. While the Blon B50's don't change my mind, they are pretty good overall. I did run into some harshness towards the higher end, my other set (Audio Technica ATH-AD700X) also have a harshness to them but not quite as bad and at a higher register. Regarding the build quality, they feel good in hand with decent heftiness to them. Comfort is subjective and for me, they're a tad tight on the clamp force. I do have a larger head (8 3/4 hat size) so that might factor in. I did test them for about 2 weeks with movie watching and listening to music, sadly, they will be a backup to the above stated Audio Technica pair and my main pair of HarmonicDyne Zeus.