Isolation is actually impressive. They isolate better than my Ultrasone Pro 900's. I tested a few things, and the isolation of the Shure 940's cuts down on more of the upper frequency stuff, I could hear less "sss" which made the back ground sound much more dull--excellent isolation. I also tested leakage, and they're relatively quiet even with volume up if the ear pads are touching all the way around. When you break the seal, the sound fills the room. So leakage is minimal, but it's there as you would expect, even from a closed phone. I would feel comfortable listening to these at mid-low volumes on an airplane. I would feel completely fine listening to them in a public area like train/bus/walking around as no one would hear it. And I'd wear them in the same room with someone else at high volume so long as they're not overly sensitive to hearing a feint music in the background.
Now granted, I was reading really fast... In your opinion, isolation and leakage are good, with velours? That's pretty cool! Do you think going to pleather would change this enough to make you want to?
(100th post, BTW. Bow to me [a little bit]!)