Yeah I agree, a bit off topic, but yesterday, I noticed Boe of Denmark in AE 2009 SF, switches from Head Metallix to Yonex Arcsaber 10. He made so many critical errors that turn the tide in the 2nd set. His nervous system and muscles are so in tuned with the ex racquet that he lost touch with the Arcsaber 10. Fu and Cai, whom used the same racquets for years promptly dispatched Boe and Morgensen. Anyway Ants was right, the NS9.9K stiffness felt like between NS9K S & X, although rated as stiffer than type X. The racquet tied with strings felt a little head heavy but overall, it's actually very similar to NS9K type X.