Harry's works great for most folks. Predictive timing is very helpful once you're trying to get that last few percent... it gives you real time +/- corner by corner to let you know intra-lap if you are faster/slower than your previous best. It's not cheap, but a great driver development tool- for this you'll want to look at an AIM Solo, VBox sport, etc. I've been happy with the in-car feedback my AIM Solo offers, though my brother's VBox's data analysis software seems better outside the car.
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