Poor sound quality,
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This review is from: Comply Tx-500 Isolation PLUS Earphone Tips - (S/M/L) Black (Electronics)
Bought these on the basis of another reviewer for a pair of Sennheiser IE80, which have a notoriously poor seal with the OE buds. These fit the ear well, and provide better isolation, but they alter the tonal balance way too much, muffling the treble and making the bass ponderous and a bit one-noted. I ended up buying some JVC generic tips that are designed to fit the wide aperture of the IE80s which sounds much better, but not great for isolation. The search continues!