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The primary feature I'd recommend is to have an auto-record/auto-off feature, then you never have to worry about whether it is on when you need it. Also, a write-over old files is handy. I lost some video I wanted (not accident related) because mine stopped recording once the card was full. I'm looking for a new one that records both forward and rearward views.

You can get some cool video regardless of your reasons. I have one of a cop lighting up a red light runner, a near buzzard strike, and a night fireball meteor flashing across my windshield. Good luck with your choice.