I like them so much I've worn out 2 pair

The problem with these is they sound so good you wear them out.  I returned my first set after about 18 months (on the original 2 year warrantee) and they sent me a brand new set.  The wires of the second set had some bad insulation, and after about 14 months they got stiff and eventually cracked.  I sent these back and discovered the warantee is only 1 year the second time around.  After some grumbling I have since bought a pair of se420s and actually prefer the e4cs sound, and size.