Sound is great for the price, and even if it was bit more expensive.
Comfort isn't great. The ear cup material makes my cheeks itchy and hot. The headbands starts weighing down on the top of my head after awhile, maybe its my egg shaped head, but it gets real uncomfortable. I wouldn't recommend them for long sessions.
I think build quality was nice for what it is.
I would recommend these as a backup, or for quickly checking up sound levels etc.