I would say the Mad Dogs are priced quite nicely for their performance and really are great bang for buck. The LCD-2's are great but I honestly don't think they're worth paying their retail asking price for.
What I mean is: the LCD-2's are definitely better but not - at this point in Australia at least - $1000 better.
That's the key. I own Mad Dogs, and yes, qualify as a fanboy. I've listened to the LCD's, was thinking about getting a pair. That is high end territory for me. I can swing it if I want to, (have to save up though). For me, I did not see essentially $700 - $800 or so in increased performance. I'm sure others do see the increase as worth while.
Small sound stage on the LCD's for an open can... Surprising to me.