Works well with my Forerunner 301.

Downloads 'tracks' showing my path and heart rate data for the workout. Very good information.

It's a good start, but could use some more features. Such as the ability to 'zoom in' on a portion of the workout for more detail. For example, highlight a high point on the heart rate chart and show the corresponding point on the map.

Also, integrating better map data would be a huge improvement. Current map data is very sparse. Google maps or USGS maps would be great.

An excellent alternative is "Trailrunner". It has a better interface, and better maps. Garmin should license Trailrunner.