If you look at this, is lin dan now using a Z slash???? It looks like it, but he has added lead tape to the top just like he did with the N90ii's https://www.youtube.com/watch?v=5_nIsb_Ea0s&list=WL&index=23
That's a new racket especially designed for him, not a Z-Slash. Besides, Lin Dan actually never used the N90 II.