The best feature of this unit in my opinion is the rear view camera. I am a stickler for using two rearview cameras on all my rides, but there are still blind spots. The added bonus of having 30 second video clips recorded and saved in the case of an accident is great as well. The unit is pretty small and not much bigger than a Garmin. For those of us in the recumbent world, where needing longer wiring is essential, the unit wiring for the camera can be extended with a simple mini USB cable. AWESOME!