Ordered a set of these and have been trying them out today. I like headphones with a warm tone, so I thought these might be something I'd like right off the bat, but I have to say, on the first day, I've got mixed feelings about them.
I listened to a few songs that I'm familiar with, mostly in lossless flac files to test the sound from the R9. I started with a song called Ghetto Love, by Spinerette. It has thumping bass in the background, and the R9 did pretty well with this song. It doesn't slam as hard as my old Fostex TH-X00 did, however, and the bass seems diffuse and overbearing.
Next up was something to test for sibilance, which is easy to find on The Shins song, Kissing the Lipless. The R9 passed this test, but overall, the sound was a bit too dull.
Female vocals was the next category, and I was disappointed by the R9's rendition of California, by Joni Mitchell. She seemed distant, which is not something I've heard from this recording before.
Male vocals: Free Ride by Nick Drake. This was really good. Surprised me.
For something a little more orchestral, I tried Hans Zimmer's No Time for Caution. Honestly, this was the worst I've heard this particular piece. My CAL! and Fidelio X2 are both superior.
Then, just for fun, I played The Black Keys, Little Black Submarine. Oh, yes. This was very nice, both in the quiet intro section with the acoustic guitar and the climactic end.
So, a mixed bag. As to impressions about the headphone look and construction, well, they look odd. They are light, but the materials aren't what you might expect from a headphone they were trying to sell for $600. I paid $109, with free shipping, and they might be worth that much. The headband is unimpressive, and the cord is too short.
I'm going to listen to them for a few days, just to get a feel for their sound. Then I'm going to follow someone's advice and try EQ with them. If that isn't good enough, I suspect I'll try a few mods to tighten the bass. Seems like there is plenty of room in those cavernous cups.