I like HJE900. I can see you really like it and recommend it in many threads. But, is it for every genre of music? I also like C710. When I suggested C710 for people who likes pounding bass, I also warned about harsh treble. Is there any earphone does everything good? Probably. I do believe most of earphones have their own strength and faults. HJE900 and C710 have different sounds, their quality is a toss-up to my ears, so why not save $30?
Radius HP-TWF11 is still "fresh" to my ears, the newness often plays tricks on me. I am, however, confident it worths extra $30 over HJE900 - I hope I don't make a mistake and have to eat my words.