Sootchucker, in short - get one.
I got one for Xmas (Nextbase 512G) - 6 weeks ago some little scroat basically veered into my TTS as I overtook him on a dual carriage way, causing 5 grand's worth of damage. I've only just got my car back. As the two little (unts got out of the car they started to have a go and the passenger started saying "my neck hurts" - I told them to stop right there, you're on dashcam, so you can stop with the bullsh!t as I've got the whole thing on camera, and it's all your fault.
Long story short, after he refused to contact the insurance company and ignored all their calls & letters, they settled in my favour as it was 100% his fault as he was driving like a proper c0ck, and they had it all on video. If it wasn't for the dashcam, it would have been my word against his, and we all know how those situations pan out. It's the best £150 I've spent in years, and has already paid for itself in this one situation proving my innocence and his guilt. Get one asap.
If you want to see the quality of mine, go onto my instagram (matchboy1976) as I posted it on there. Really, they're a life saver.