My local LBS owner has them on his Globe that he uses as his commuter. He says he wouldn't trust them to be his only light, but they are nice when it's gray/darkish out during the day when he's running errands to the bank, PO, etc. They look cool and seem like it'd be nice to have on the bike all the time "just in case." I always have a taillight on my bike "just in case" and it's much brighter, but these are nice because they don't require those blasted earth destroying batteries.