Advice needed -Which trackday cam/ bullet cam?

[I'm Rick james]

Hi All,
I'm on the lookout for a trackday camera to be mounted on the exterior of the car, have been looking at bullet cams and all sorts...
Have found this on eBay: http://www.ebay.co.uk/itm/140880768238?ssPageName=...

Is something along these lines worth it or should I go go pro?
Any reccomendations or help would be great...
Thanks

[Dave 500]

I would stick with one of the well known ones, Contour, GoPro etc etc.

Have a look at Dogcam's website they now supply some cheaper ones to get you going and have really good customer service.