A few months ago I broke my Hf5's for the third time and the warranty was over. I really liked the sound but I'm not willing to buy another pair because they keep breaking despite my best efforts to treat them nicely.
To replace them temporarily, I bought a pair of Grado igi's because they were in my price range and in stock locally (I live in Portland, OR). I was also curious to compare them to the Hf5's. Overall, I don't think very highly of them.
Please see my review here:
Now, I'm ready to step up to a better IEM. My price range is $400 and under, including accessories. I'm willing to get an amp within that price range, or to add one later on (a can of worms I have yet to open).
What I really like about they Hf5's is the overall analytical detail and clarity. I'm a musician (drummer) and I love to really dig into what the musicians are doing, so separation is critical for me. It is the combination of warmth and clarity which I really enjoy about the Hf5s. I would like to have more balance and maybe something a bit more gentle. I don't like overemphasis on lows. (see above review for more detail on my tastes).
I primarily listen to jazz fusion, contemporary jazz, and hip hop.
If you have any questions or thoughts, please let me know!