Isolation and fit are very important for IEMs. As I noticed earlier, the design is similar to Westone's UM series, and by it's looks and experience with UM3Xs, I can assume the PL-50s do fit better and comfortable.

I think the IEMs are very nice for those who want experience how the BA driver sound like. I am totally a BA driver fan after listening to PFEs, and now UM3Xs. The price is cheap for the BA IEMs, and I hope I can listen to it someday.

Paca : Want to try the PL-50s ?