It (N90II) was also used by Zheng Bo and is currently used by He Hanbin and a few players in Eastern Europe (e.g. Jakub Bitman, Czech national champion).
Personal preference, probably the stiffness of the N90II being more to his favor. All the pros decide what racket to use based on two simple criteria: I. What racket feels comfortable? II. Will I get a bonus for using a specific racket which I can still play with? Of course they're always bound to their current sponsor And they're still human, so some just like to experiment (like JJS, who for a while changed between the SW35, SW37 and MX80 regularly, even during matches). Others like LCW probably get a nice bonus if they decide to switch to the newest model.
Hi Jackie, (greetings from Osnabrück) yes I saw that, too. He was using Z-Force for some tournaments and then switching back to VT80. Was there something like an "official statement" why he switched back? Think Yonex wasn't enthusiastic with that
. Clearly yonex didn't take it well, if you look at the staff advisory page it still says he uses z force.