Now, 3 of my Vcore89s are strung with Luxilon (ice blue) Alu Power and the other 3 with WC Turbo Twist. The former is a tad more powerful and the latter a softer feeling.
It is better to have it and not need it THAN to need it and not have it!
Tour 89 Lux Alu Pwr @60 Lbs. X-One 17 @65 Lbs.