From my post "helmet Cam"
Had mine a few weeks now and battery lasts a day so the new drift must be improved! and well worth the money, great results

I been looking for a while, couple of years in fact on & off. The pro seems to be too easy to hit and was too expensive so that was out, there are some nice neat looking ones but reading reviews it was a mine field with so many swings & roundabouts.
In the end I found one that fitted the bill and after a few nights searching as you do I found one on ebay starting at £49!
So watched that start to rise and looked on Amazon & found the same one new Amazon.co.uk: Used and New: Drift HD170 Stealth Action Camera
So ordered that and watched the ebay s/h one reach the same price and the fools are still bidding
There are some good tips on Drift HD170 Stealth Camera - 1080p POV - Drift Innovation
BUT do look around because the prices are all over the place, no doubt at some time they will be cheaper but I had a good deal and got it when I wanted it.

Looking forward to trying it out on all sorts of things so you may even get to see it working