I am using NRG2-17G for my new racket, Wilson K Blade Tour 93SQ mid. Absolutely, fantastic. But I am curios how about the Blade with X-One Biphase 17G? Actually I used x-one for my old racket, Head Microgel Prestiage Midplus. The X-one is overall good, but not impressive. You know two of them are released from same company, Technifibre. But I am wondering that two of them is not exactly same one. What difference are there between two. Which one provides more feel and touch? Why do you use one of two? Particularly I want to hear from those who used both of them on same racket. Any comments, appreciated!