I've been racing with a powermeter for 3 years and I don't really look at my computer while racing, afterwards the data is awesome though. In the pack, it doesn't matter. In a breakaway, you do what you have to do to stay out front, if you're pulling through at 27mph, you do that, it doesn't matter what the wattage is.

You know what, stupid question time.

I thought Quarq was an extension to a cycling computer, but it isn't, is it? What exactly does it measure, what does it measure that a cycling computer can't, and why is it important?

a quarq is a powermeter where the power measuring device is in your crankset. it allows you to track ur power just like any other powermeter.