I have a Garmin etrex vista and have the mounts (not velcro, clamp to handelbars) for my city bike, my MTB and my road bike. I also use it when driving. Its moving map is great for finding your way in unfamiliar terratory on or off the road. The unit is also useful for workouts as it gives speed and distance broken down in a varity of ways. I find the size to be perfect, any bigger and you wouldn't want it on a bike and any smaller and you wouldn't be able to read it (I can without my reading glasses). I would however have prefered the new color version as it makes it easier to tell the difference between a path you traveled over and a road (or trail) as they are different colors where as the B&W unit shows both as black lines.