Anyone have an opinion on the ZIP-N-HIT. You've probably seen it. The softball on two strings that you tie to a pole, then pull apart and the ball "Zips" to the batter at 45 - 50 MPH. It's cheap and I can see it as a possible suppliment in gym practices over winter. The problem I have is that the instructions say "always hit down on the ball" and in fact since you bat is above the string when you start your swing you have to hit down. Anyone find a use for this device? Derick Jeter sure likes it!