Agreed, but I preferred the comfort of the stock pads. Even though they are closed back, they walk the fine line between sounding open and closed.
They aren't meant to be taken around in public, they don't fold, don't have a storage case etc - so I don't really consider the lack of isolation to be an issue with them, in my books.
And mids? I don't understand why this is constantly such a contentious issue. Just to clear up any misconceptions for anyone lurking/reading the thread: The TH600 mids are fine to my ears. I prefer the mids of these to most other cans in the "basshead" world, personally.
They are also very comfortable, which is worth a lot to me.