My EX71s broke last week (no apparent reason).
I thought this would be a great opportunity to get something higher-end (better?)
So after reading the forums, I decided on getting a pair of ER-6i. After about 2hrs with them, my first impressions are not good. I listen to mainly electronic music and hip-hop, and I thought the 6i would have enough bass to make me happy. I am going to try to play with the EQ more and see if it helps. apart from the bass, I didn't really find the clarity and "feel" of the sound from these phones and did not find anything special about their sound.
Also, the 6i is kinda painful for my ears. I was using the smallest tips with my EX71s, so I think my ears might be on the small side. The ER-6i go pretty far in the ear (especially when compared to the EX71s), and when you pull the out, the vacum created hurts my ear drum and etc.
I'm going to give them another day or two and probably exchange them for Shures E2s or E3s.
For someone with my music tastes, the ER-6i just does not fit.
I miss my EX71s, and I hope I can find a replacement better than they are for my type of music.
Hope this helps.