Lights

fwiw, I liked it while it was working, only gripe is that the headunit casing has a kind of hood around the lens which shields it from view by the rider - means that it if cuts out (as mine did) or if you just run out of battery power - you may not even notice immediately (e.g. if riding on well lit streets where your own lights throw may be less evident).

On un-lit roads this bug is a feature: Almost any light coming directly from the lamp would be brighter than the return from the road, so make it harder to see where you are going.