First off, let's just get the negatives out of the way.  The MDRMA900s feel and look like $20 headphones.  I have no idea what Sony was thinking when they designed these.  They feel and look cheap.  The cable is also extremely long and thin.  It does not exude quality.  However, I suppose there is a bright side to the cheap materials used here - the MA900s are feather-light.  When I say light, I mean they are the lightest full-size headphones I have ever used.  They truly disappear on your head when wearing them.  They are one of the most comfortable...