Actually I have been thinking of buying this kind of ear piece for my music listening on the go for the past 3 to 4 months but due to the steep price, I kept putting off. Hv checked a lot of webbies regarding all these ear pieces. There are Westone, Ultimate Ears, JH Audio, 1964 Ears, Unique Melody & FutureSonics are the main brands for the ear piece. The 1st 3 are the biggest brands.
Heo Young Saeng & SNSD are using UE1 Pro and UE18 Pro respectively. Big Bang & YG entertainment artistes are using JH Audio.
For majority of the Japanese Artistes, they are using FitEars.