Hello Amazon!I have had the Beyerdynamic DT 770 M headphones for about 3 months now, and I have had a chance to use them while both drumming and listening to music from my iPod.Starting off with Build Quality:The headband is all metal wrapped by black pleather. Cushioning is soft and comfortable, however the material is somewhat thin. Fortunately the pleather wrapping is removable and can be easily replaced. Headphone size is easily adjustable and can fit any size head. Clamping pressure is strong but necessary for isolating noise. One note on size; these headphones are not collapsable, however they fit well in the included zippered carrying case. The cones are attached by strong metal forks extending from the headband and the cones are made of hard plastic. The DT 770 M's are built to last. The cord has ample length and can fit a screwable sound board adapter. An inline volume slider on the cord is a nice touch to allow on-the-fly volume adjustment.Sound Quality:This is really the only aspect of the DT 770 M's that I was disappointed about. The mids and treble are there, but the bass is almost non-existant. It is easily understandable why this would be, since there is no cone ventilation to allow the drivers to move. This is not a big issue though, since as a drummer, all you really need to hear is the accompanying band. Too much bass in these headphones would make it difficult to discern what you are playing on the drumset, and what the band is playing. In all reality, I love these headphones for their isolation, not their sound quality.Isolation:The real purpose behind Beyerdynamic producing these headphones. Beyerdynamic has done a masterful job in striking a balance in noise isolation that is perfect for a drummer. When drumming, I can easily hear what I am playing, without having to turn up the volume of the surrounding band. It is as if you are wearing the best ear muffs available, and having audio drivers placed in the cones. Perfect for drummers. One note on the ear pads: the pleather gets sweaty very quickly. This is not so bad however, since the sweat actually makes the pads seal to your head, providing even more isolation. It sounds gross, but it actually works.Verdict:These headphones are meant for drummers, not for daily music entertainment. You would be horribly dissatisfied listening to these through an iPod for casual listening. Think of the sound through this example: Mids and treble to be like the Audio Technica ATH-M50's, with little bass. If you are a drummer, you should not waste your money on any other headphone. These will make you happy for what they were designed to do; isolate sound and provide additional band audio. They are worth the $200.Summary: Beyerdynamic DT 770 M HeadphonesPros:Isolation is Just Right for DrummersTank Build QualityHandy In-line Volume SliderComfortCord Length (long)Mids and TrebleCarrying CaseCons:Overall Sound QualityBassRecommendation: For Drummers only. Not for daily music listening.Thanks for reading my review!