ok, I gotta ask the question no one asks - is there really a difference? As the slow guy who's always following someone else I see lots of rear flashers. None stand out as brighter than any other. Does anyone have any evidence of better visibility or is it all anecdotal? Don't anyone get their panties in a wad - I'm a gadget geek and love the latest gizmos. But is a $40 hotshot really "better" than $10 cateye?