I use it with my Garmin Edge 800 (for bicycles) for running. The Garmin Edge clicks in with a twist, and I know I won''t be dropping $400+ on the payment. Now I can do everything a cheaper Forerunner can do (distance, HR, speed, elevation, etc) and map my run. Yahoo. Seriously, I''m too cheap to by something when I already have something that will do the job..