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 49/45. (Ezones Xi put away for now) 1x Yonex Ezone Xi Team Plus (Poly HS 54/50) for doubles---Yonex PC Light!