Didn't have a lot of time to listen this evening, will give them a workout tomorrow though.
My first listen was Radiohead's Kid A on vinyl. This is a very sonically diverse album which I figured would be good to test them out. The bass is definitely as good as others have said, very prominent and punchy but doesn't muddy the midrange at all. One thing I never noticed before is that some of the electronic bass percussion actually has a very trebley attack, which is crystal clear with the TH-X00s.
Soundstage isn't huge but is faaar better than my Sonys, which sound like every instrument is an inch from your ear.
I love them, and now I'm in no rush to get my modded ones.