Hey All,   This is my first head-fi review and I am proud to say that these Beyerdynamic DT770 Pro 80 are wonderful!  I currently own a pair of Bose QC2 and the ATH-M50x and wil be using those to compare.   The 770s are built tough, rugged plastic and mostly metal here.  The velour pads and headband seem sturdy enough and I have already seen you can buy replacements from Beyer for quite cheap.  The build on the M50x and QC2 are mainly plastic with the only real metal being in the headband.  They are still well built and nice looking though...