Quality:
Made well, look like clones of the sonys, almost. The 1/4" adaptor stays on better too.
Value:
Yes. Oh, I chose them at a store with tons of models to choose from, the ATHM20's were thin and awful, and the 40's sounded really weird... the mid-priced ATHM30's sounded best of em all, until I got up to the $150-250 Sennheissers etc.
Sound:
I bought a bunch of these instead of MDR-7506's for recording. Less expensive, less exaggerated high end and a fuller low end. Overall less hyped sounding, and the fuller bass helps the rhythm section hear themselves. In two years, 2 out of 16 broke one speaker each, that's a lot less damage than a room full of Sony's.
Overall:
These met my goal of being cheap enough to buy 16 of em, but still sound satisfying. If they didn't sound good, I would have bought zero of em.
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