I recently bought the Soundmagic ES18. For $12 this IEM sounds great. It sounds very "musical". Several reviews claim it sounds very much like the the Soundmagic E10, which is 3X the price. I have never heard the E10. The ES18 does has a light and cheap feel to it, however one shouldn't expect the world for $12. It has a 10mm driver so it doesn't have the very low bass impact that IEMs like the Sony MDR-EX210B with 13.5mm drivers has. Imo the Soundmagic ES18 does sound so much better than the JVC HAFX101. While the ES18 sounds like it has a bit of extra bass, its bass sounds much more natural than the bass on the HAFX101. I would love to see Soundmagic come out with a 13.5mm driver IEM similar to the ES18.
For only $12 the ES18 is a great buy.