I first saw this device at work. One of my friends uses it to keep track of his workouts. He is a big time runner. I am just getting into the walking/running thing. I usually bike. The great thing about this device is that it has a mode for walking and biking. It keeps the two files separate so each sport can be looked at individually. As you can see it is a little large but is light weight and after a few minutes you don't even know its there. The screen can be set up to monitor a variety of points. I have my main screen set to show total time, total distance, mile pace, and heart rate. My main tracking point was heart rate. I wanted to make sure that I was getting into a good aerobic rate. The heart rate strap is hardly noticeable. This device keeps track of the workout and then you can down load the data to your computer and see all of the data plotted on a chart. I'm far from being a running/biking nut but this sure helps me get a better workout. The device picks up the satellites quickly and works even when I'm off road in the trees. This is a great training device. Great even for beginners.