I have 2 months riding time on my Supernova E3 single, I am very satisfied. Plenty of light for the street at less than 20mph, it's always ready. I added the Supernova tail light, it's made to fit on my Topeak rack's DIN standard mount. The Supernova kit is well sorted out, everything works together with no issues. I've got to figure out the wires...Look, Ma, no batteries!