Hi, first time posting in many many years. I am looking for some IEMs for my Iphone 4. For headphones, I currently own the Sennheiser HD580, the Koss PortaPro, and the Klipsch S4i. I like a little extra bass, so I went with the S4i recently, partly because it seems to be more robust/reliable than some of its competition such as the Sennheiser MM 50 iP and has a better high end than the Shure SE115m+. Surprisingly, the S4i's may have a little too much bass for my tastes. Granted, they aren't quite broken in, which many posters seem to believe they need a lot of. But as of right now, after about 15 hours of use, I feel like the bass is overwhelming the other frequencies. The MM 50's seem to get panned at Amazon and the Apple Store for their quality. But I look at the frequency response at Headroom of the MM 50's and they seem pretty close in signature to the HD600 - at least they have a family resemblance. Just the other day, I came across the MM 70 iP at the Apple Store. I look on the web everywhere looking for some review from someone, anyone. Nothing. It seems like the Apple Store and maybe one other obscure store are the only ones in the whole world that sells them, and there are no reviews. I am intrigued because on the Apple Store website it says "Robust, dynamic drivers and specially reinforced cables provide the final word in comfort, durability and sound quality". Specially reinforced cables?!?! Does anyone know anything about these? Do they sound like the MM 50 iP? Do they really have an increased reliability over the MM 50 iP? Any help/guidance you can provide would be much appreciated.