I wonder if anyone has tried the Winsock warm up device on ptwinsock . com? I came across it by chance and I'm just curious. Seems kinda pricey... But wonder if it really helps as advertised, or maybe the opposite, hurts your game. Also on their website, they have this TruVue backboard that looks interesting because of the way they paint 1/2 of the tennis court in, until I saw the price and just about flipped over my chair.