I will probably just wear my cheap Polar HRM for me to watch the heart rate, but not worry about the speed. I talked to a friend the has been running for quite some time. Not for speed, but for fitness, and he said there are days that he struggles to finish his run anywhere close to what is normal and there are days he is way ahead. It all depends upon how he feels on that day. He will do some track running to check his speed once a month maybe at best. The nice thing about our track is the new blacktop coating that is supposed to be better for the joints.
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun