Though modular cables aren't that popular, they serve the purpose for someone like myself who often stores the audio player in the shirt/jacket/pants pockets. Nowadays with bluetooth devices such as the Sony MW500 or the Samsung HS3000, having a short modular cable is very convenient compare to a 4' long cable. I've read a lot of reviews and done a lot of digging of modular earphones with the similar sound signature as the Shure SE530 & SE310. Recently, I bought a pair of HiFiMan RE-262 and a pair of RE-272 after reading so many reviews. Unfortunately, the modular cable of RE-262 & RE-272 have TRRS plugs which required them to be used with the 2' long adapter cable and totally defeat the entire purpose of modular cable. So, they're not true modular at all. Besides that, I think I've used the RE-262 for about maybe around 40hrs only to discovered the sound quality is still not as good as the Shure SE310 in the vocal sense. I'm a pretty disappointed with this. It might not have been the amp problem because I listened to music with my Samsung P6800 tablet and a 2009 Macbook air. The RE-272 box has not been opened. After reading all of the praises about the mids of RE-262, I'm quite disappointed with the output. There's slight sibilance in RE-262, bass is good, the vocal is good but doesn't come to life like the Shure SE310/SE530.
Preference: non-sibilant, poor base, vocal/mid-centric, good instrumental separation.
The list so far for the top end $100+:
HiFiMan RE-262 (not true modular)
HiFiMan RE-272 (not true modular)
List for earphones under $100:
MEElectronic SPORT-FI S6
JAYS t-JAYS Three
Hopefully, there are more options for a pair of mid-centric earphones with modular cable or I would have to one buy back the Shure SE310/SE530 or two cut up the 4' cable and solder it to a right angle 3.5mm plug.