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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
During the lighter months my cheapies (Apeman and that Aldi thingy) are all you need but come winter they are absolutely useless. Bit of rain and darkness and its all just a blur.
Edit: Will the expense of the Fly6 get me visible winter pictures?