i went back to listening to the HF2's with bowls today. it is nearing the 500 hour mark and the sound has opened up for me significantly. they seem to be nearing it's final stage. i'm really starting to enjoy them now; they have opened up really nicely, i don't get that congested feeling like i did before: bass cloud is gone!!
the bass is still very present but it's not exaggerated like before. before, the bass was nice but sounded unnatural and did not sound like a grado. on bass heavy tracks, it can still be heard with nice oomph and texture. still more present than any other grado i've ever heard.
i think it will be safe for me to say that i'll put the HF2 right in between the RS1i and the 325i where it belongs. it does have the best of both worlds to me. the detail of the 325i mixed with a bit of the tonal richness and timbre of the RS1i. soundstage doesn't quite go as wide as the RS1i due to its cups i think, but still very nice.
it is a little more refined than the 325i, the sound being more textured, but not as much as the RS1i. in terms of speed, the attack isn't as fast as the 325i and sounds more laid-back in comparison. but still having that same crispness as the 325i. the HF2 does acoustic just as well as the 325i but in a different flavor.
on regular tracks, it still sounds very neutral to me, which is nice. my salad bowls have shipped, so i'll be able to see next week how the sound changes and if it is significantly better than regular size bowls.