Build Quality Other than its predecessor, they are build out of plastic. This doesn't have to be bad. There is plastic and then there is plastic. My HD 580 Jubilee are also mostly made out of plastic and are still standing strong. I just hope, that the plastic used in the Momentum 4's can withstand sun exposure, because I'm mainly going to wear them out and about. Only time will tell. Comfort Coming from a pair of Sony XM3, the Momentum 4 are a step-down. They aren't uncomfortable, but could be better. The ear cups are on the smaller side. For my...