It looks terrific on my Xi's, that is beautiful blue.
They do have other colors in badminton strings and should launch a red string for all their red racquets. I don't think they're worried about prestige users, lol.
Back to the topic, poly tour spin string is maybe the best string on the market right now.
2X YY 97T 310 with YY PTSPIN 47/43. ---Yonex PC Light, waiting for VCore TourG. Stan is the MAN.