I got my two new pairs in last night. Tried modding one into an open headphone by cutting out the back wall of the cup. Tried the stock pads and the Beyer velour pads. They didn't sound very good. The bass response isn't quite as elevated, but the dip in the mids is still present. Other than that, they sounded very confused and stuffy. They sounded much more distorted than they did closed.

I tried seeing how the sound changed when I moved them away from my ears...it's interesting how good they sound even from a couple inches away ("good" is very relative in this situation). I'm still thinking they could make for a good open can, but they'd need some specific tweaking. I'm guessing the pads I've tried won't work so well for them as they are.

I was going to see how they'd sound with memory foam in the cups (still open), but then I accidentally disconnected the solder points...OOPS.

I'll get back to those later.

I should mention that the stock unit sounded noticeably more bloated than my modded unit. Bass was just thick and overwhelming. The dip in the mids sounds much worse stock. At least, it sounds like it is much broader and deeper overall.