I had the FX101s for a short period of time and I was really enjoying them. That was until something went wrong in the left earbud. Most say its a cable connection fault. No matter what, build quality is a cause for concern in these, especially the cable. The plastic body although makes them light, also makes them more susceptible to damage. Since they were gone I got the JVC FX1X instead. A WORLD OF DIFFERENCE. Much more refined sound, even punchier bass and way better build. If planning to get the 101s please do consider the 1Xs as well. But if you are new to earphones, the 101s remain my recommendation.
Reviews by topgear
If you don't mind extra treble, the JVC HAFX40 has much better sound overall, although it hurts my ears with some music, as I am a bit treble sensitive. Otherwise I like the detailed sound very much. It also has good bass.
For strong bass that sounds natural, I love my Sony MDREX210. It has 13.5 mm drivers.
I also like the Panasonic RPHJE450 for its nice bass and great fit, althout it seems to be lacking slightly in detail, especially when compared to the Panasonic RPHJE355 or JVCHAFX40, The HAS355 is a bit bass deficient though.