davgreg
Have a set of these and they are decent but not great, but apparently unrepairable.
Those little wings that help hold them in place tend to tear over time and are not repairable in any way. Mine developed the tear just after the warranty expired and the price of fixing it was like $80 at the Apple Store. I "repaired" them with Super Glue and they are the knockabout headset. Bought a set of Bose QC 2s that are vastly superior in noise cancellation and sound quality.