I still question this Headamp.   Build qualilty looks good (the inside i dont know about) but still it's just another "made in China" casing.   There are several other headamps from china in this disguise... Argon is supposed to be HIFI klubbens own brand. I have a feeling that the only difference between this ha1 and other headamps looking the same are the name on the front and the power supply.    Talking about the power supply (220volt one) IT's HORRIBLE. you feel it right away...plastic on this regular looking powersupply is so poor...

  My trust in Sennheiser is gone   For more detailed review on the sound itself there is alot of other really good reviews..this review focus on value for money.   Short said... Don't buy       Been a fan of sennheiser for many years...my trust is now completely gone!!! I own 4 pairs of sennheiser, HD650, 595 and two pairs of in-ear... always use my HD650 at home and the in-ears when im on the move.  A few years back i spend money on a pair of hd 595's to use on the move but never really used them because the in-ears is easier to...