Got my HE500s today and I'm not sure if I like them..
Out of the box, they controlled sub-bass superbly.. and the mids were creamy... but the >~2kHz, the frequencies seemed a bit nasal and recessed to me.
After I applied an eq in Foobar, the sound is a fair bit better; less nasal and more highs... but I'm not convinced these are 5x better than the Shure SRH840s which are now only $149AU.
I will check the Impedance of the drivers with my friend's multimeter, will burn the HE500s in for at least 50 hours, then will take them to addicted to audio to compare them with the LCD3, SRH840s and grado RS1s with accompanying EQs..
I only committed myself to spending $700 knowing that I have 30 days to try them.
If you really like your SRH840's then you would absolutely love the SRH1840's. I'm just saying...