I use my Garmin on my road and my mountain bike. All I use for tracking on my mountain bike is the Heart Rate monitor. I like seeing what heart rate zone I'm in so I can control my cadence/gear ratio appropriately. Riding the road bike I use everything. I just don't seem to get as much useful information from cadence meters or power meters on the MTB especially when I'm worried about it flying off or breaking when flying over rocks.