I have one original VS Team NG(non-BT7) and a few Wilson NG. I was pondering if I should stock large number of Wilson NG before Babolat's BT7 trickle down to Wilson NG. You know Babolat does OEM for Wilson NG. I wonder if Babolat will soon switch to BT7 for Wilson also (for saving cost, I guess). I don't know when "ThermoGut" coating was introduced. Did that coating propagate to other OEM NG's Babolat manufactured for other brands fairly quickly?