I just got my hands on the HF-2. Unfortunately, for only a couple of songs on a solid state amp, none of which I'm familiar with and I didn't have my RS-1 for comparison.
The most I'll say now is that they
are Grados.

If you love the house sound, you won't be disappointed. Fit'n'finish is good - I like the leather headband and cups.
Also, these had flats on. I'd think they'd change with bowls.
I'm happy with the HF-2 and want to give it a longer listen. Todd, you can run my card right now.
