I love it!
The new Leaderboard layout is so far generating around 40% more clicks with at least as good EPC as before for me.
The new layout looks OK in my site, but I do understand that not all advertisers are happy with it. Maybe an idea to let advertisers choose which layout they want for their sites?
Also, I do expect CTR to slowly decrease from the sudden +40% increase as my visitors get "used to" (or blind) to the new layout. A large portion of my audience re-visits my site a lot, so this sudden change made lots of them curious enough to start clicking, I guess.