Our Verdict 
Extremely impressive for closed-back headphones
Detail and rhythm is very good
Lose of bass extension and richness
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Fancy the Sennheiser PMX 100s but don't want to annoy folk with leaking sound? Try the closed-back PMX 200s instead.

The design is very similar, but you do lose some bass extension and richness, and they sound a bit closed-in. Still, overall detail and rhythm is very good, and for closed-back headphones they're extremely impressive.