I've recently strung my Thruster K9900 with VBS63 @27-25lbs w/ 10% prestreched. At first, repulsion felt nearly as good as my Meteor X80 strung w/ Yonex Exbolt63. Although the VBS felt softer than the Exbolt, hitting sound were not as lively as Exbolt (I would say the VBS sounded rather dull). After a week playing w/ the VBS (playing 3times a week at club level), repulsion went down a bit. The Exbolt on the otherhand felt almost as good since day One. Personal preference, ranking 0.63mm string: 1. Yonex Exbolt (Victor Meteor X80) 2. Lining No.3 Boost (Yonex Voltric 80 Etune) 3. VBS 63 (Victor Thruster K9900) Sent from my CPH1613 using Tapatalk