Bought a pair today. HP50 in black. Definitely the best of the closed headphones I tried at the store (I also go to Worldwide Stereo near Philly) vs P7 and M4U1, but maybe less crisp than HD650's. But I need closed phones for the train.
In testing at home against TH900 (ok 5x the price) I had a little buyers regret on the NADs, because they seem less accurate but it's only on certain songs and isn't that why we own more than one headphone?
Setup: MacBook or iphone4s to Resonessence Herus and sometimes a JDS bbCmoy
I'm pretty sure any 'buyer's regret' will vanish if you upgrade your amp (doesn't have
to be too big of an upgrade). Assuming you're using a good soundcard and sourcing
from lossless files. I'm finding that these headphones like power, and are demanding of
high quality input.
(Not saying that they're as good as the TH900 or HD650 but at their price they're
excellent closed headphones and with the amp upgrade you'll really enjoy them.)