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I don't think there's a huge difference. Once you get rain on the lens and following car headlight glare it's all a bit of a mess. But you still generally get enough to grab plates off stuff (running front and rear really helps). If you wanna dob in mobile phone users though you really need a helmet cam - that might also help keep it cleaner and higher so be more useful in winter. I've not gone there yet although if there was a lightweight helmet camera that could be stuck on one side I'd love to get rid of the big Apeman off the bars
I've had no issues with my older version Fly6 and neither has the missus with her £10 knock-off version. Conclusion: user error.
Seriously though, I never liked the idea of combining lights and camera. I want all the juice for my lights if I've forgotten to charge it. I run mine now in addition to a dynamo setup. Apeman front, Fly6 rear.